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Glossary of Chemistry Terms
beginning with letter A
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AB Tweet Definition of AB Like Definition of AB on Facebook
  1. A blood type of the ABO system that has a both blood antigens and may receive all blood types, and donate to AB.
  1. Alberta (Canadian province).
  2. able-bodied seaman.
  3. also.
  4. antiballistic.
  5. Bachelor of Arts.
abiological Tweet Definition of abiological Like Definition of abiological on Facebook
  1. Pertaining to inanimate things.
ABS Tweet Definition of ABS Like Definition of ABS on Facebook
  1. Anti-lock braking system
absorb Tweet Definition of absorb Like Definition of absorb on Facebook
  1. (transitive) To include so that it no longer has separate existence; to swallow up; to engulf; to overwhelm; to cause to disappear as if by swallowing up; to use up; to incorporate; to assimilate.
    • Dark oblivion soon absorbs them all. - Cowper
    • The large cities the wealth and fashion. - W. Irving
      1. (transitive) To suck up; to drink in; to imbibe; as a sponge or as the lacteals of the body. - Bacon
      2. (transitive) To learn
      3. (transitive) To engross or engage wholly; to occupy fully; as, absorbed in study or in the pursuit of wealth.
      4. (transitive) To consume completely.
      5. (transitive) To endure.
      6. (transitive) (physics) To take up by chemical or physical action.
      Heat, light, and electricity are absorbed in the substances into which they pass.
      1. (transitive) (finance) To assume or pay for as part of a commercial transaction.
absorption Tweet Definition of absorption Like Definition of absorption on Facebook
  1. The act or process of absorbing or sucking in anything, or of being absorbed and made to disappear; as, the absorption of bodies in a whirlpool, the absorption of a smaller tribe into a larger.
  2. (context, chemistry, physics) An imbibing or reception by molecular or chemical action; as, the absorption of light, heat, electricity, etc.
  3. (physiology) In living organisms, the process by which the materials of growth and nutrition are absorbed and conveyed to the tissues and organs.
  4. Entire engrossment or occupation of the mind; as, absorption in some employment.
AC Tweet Definition of AC Like Definition of AC on Facebook
  1. (electrical) alternating current, Alternating Current
  2. (electrical): often used to indicate an alternating potential rather than a current, as in 110V AC.
  3. Air Conditioning, usually: A/C
  4. as charged, as in: guilty as charged, usually: a/c
  5. Area Code
  6. all clear, as in button on electronic calculator
  7. (internet slang) audible chuckle
  8. (set theory) axiom of choice
accelerant Tweet Definition of accelerant Like Definition of accelerant on Facebook
  1. a substance that accelerates the development of a fire; especially some petroleum product used to spread an act of arson
accelerator Tweet Definition of accelerator Like Definition of accelerator on Facebook
noun Often used adjectivally
  1. One who, or that which, accelerates.
  2. A device for causing acceleration.
  3. A substance which speeds up chemical reactions.
  4. accelerator pedal.
acceptor Tweet Definition of acceptor Like Definition of acceptor on Facebook
  1. One who accepts.
  2. (context, In law and commerce) one who accepts a draft or a bill of exchange; a drawee after he has accepted.
  3. (chemistry) an atom or molecule which can accept an electron to form a chemical bond.
  4. (physics) a chemical acceptor atom forming a positive hole in a semiconductor.
acetal Tweet Definition of acetal Like Definition of acetal on Facebook
  1. (organic chemistry) Any diether of a geminal diol, R2C(OR')2 (where R' does not = H).
acetaldehyde Tweet Definition of acetaldehyde Like Definition of acetaldehyde on Facebook
  1. (organic compound) An organic compound (CH3CHO). Sometimes called ethanal or acetic aldehyde. See aldehyde.
acetamide Tweet Definition of acetamide Like Definition of acetamide on Facebook
  1. (organic compound) The amide of acetic acid, CH3CONH2.
acetate Tweet Definition of acetate Like Definition of acetate on Facebook
  1. (organic chemistry) Any salt or ester of acetic acid.
  2. cellulose acetate
  3. A transparent sheet used for overlays.
  4. A disc of aluminium covered in a wax used to make demonstration copies of a phonograph record.
acetic Tweet Definition of acetic Like Definition of acetic on Facebook
  1. (organic chemistry) Of a pertaining to vinegar; producing vinegar; producing vinegar; as, fermentation.
  2. (organic chemistry) Pertaining to, containing, or derived from, acetyl, as ether, acetic acid. The latter is the acid to which the sour taste of vinegar is due.
acetic acid Tweet Definition of acetic acid Like Definition of acetic acid on Facebook
  1. (organic compound) A clear colourless organic acid, CH3COOH, formed by the oxidation of ethanol; it is used as a solvent and has very many industrial applications; it is the major acidic component of vinegar.
acetimeter Tweet Definition of acetimeter Like Definition of acetimeter on Facebook
  1. An instrument for estimating the amount of acetic acid in vinegar or in any liquid containing acetic acid.
acetin Tweet Definition of acetin Like Definition of acetin on Facebook
  1. (Chemistry): A combination of acetic acid with glycerin - Brande & C
acetometer Tweet Definition of acetometer Like Definition of acetometer on Facebook
  1. Variant of Acetimeter - Brande & C
acetone Tweet Definition of acetone Like Definition of acetone on Facebook
  1. (organic compound) A colourless, volatile, flammable liquid ketone, (CH3)2CO, used as a solvent.
acetonitrile Tweet Definition of acetonitrile Like Definition of acetonitrile on Facebook
  1. (organic compound) The simplest organic cyanide or nitrile, CH3CN.
acetyl Tweet Definition of acetyl Like Definition of acetyl on Facebook
  1. (organic chemistry) The univalent radical CH3CO- derived from acetic acid.
acetylene Tweet Definition of acetylene Like Definition of acetylene on Facebook
  1. (organic chemistry) Any organic compound having one or more carbon-carbon triple bond; an alkyne.
  2. (organic compound) ethyne, Ethyne; the simplest alkyne, a hydrocarbon of formula HC�CH. It is a colourless gas, with a peculiar, unpleasant odour, formerly used as an illuminating gas, but now used in welding or metallurgy.
acetylide Tweet Definition of acetylide Like Definition of acetylide on Facebook
  1. (organic chemistry) Any organic compound derived from acetylene or a terminal acetylene by replacing a hydrogen atom with a metal.
ACID Tweet Definition of ACID Like Definition of ACID on Facebook
  1. analysis console for intrusion databases
  2. (databases) Atomicity, Consistency, Isolation, and Durability (see Wikipedia:ACID, Wikipedia article on this topic)
acid anhydride Tweet Definition of acid anhydride Like Definition of acid anhydride on Facebook
  1. (organic chemistry) A class of organic compounds having two acyl groups bonded to the same oxygen atom. They react with water to give carboxylic acids.
acidic Tweet Definition of acidic Like Definition of acidic on Facebook
  1. Being sour or having the strength to neutralize alkalis, or turning a blue litmus paper red.
  2. (mineralogy) Containing a high percentage of silica; -- opposed to basic.
  3. Of or relating to acid; having the character of an acid, as an acidic solution.
acidimetry Tweet Definition of acidimetry Like Definition of acidimetry on Facebook
  1. (chemistry) The measurement of the strength of acids, especially by a chemical process based on the law of chemical combinations, or the fact that, to produce a complete reaction, a certain definite weight of reagent is required.
acidity Tweet Definition of acidity Like Definition of acidity on Facebook
noun (acidities)
  1. The quality or state of being acid
  2. The quality of sour; sourness; tartness; sharpness to the taste, as in the of lemon juice.
  3. Med. Excessive acid quality, as in gastric secretions.
acidulate Tweet Definition of acidulate Like Definition of acidulate on Facebook
verb (acidulat, ing)
  1. (transitive) To make something slightly, or moderately acid; to acidify
  2. (transitive) To make sour in a moderate degree; to sour somewhat
acidulent Tweet Definition of acidulent Like Definition of acidulent on Facebook
  1. Having an acid quality; sour; acidulous.
  • With anxious, face - Thomas Carlyle
acrylamide Tweet Definition of acrylamide Like Definition of acrylamide on Facebook
  1. (organic compound) The amide of acrylic acid, CH2=CH.CONH2; used in the manufacture of polyacrylamides.
acrylic Tweet Definition of acrylic Like Definition of acrylic on Facebook
  1. (organic chemistry) An acrylic resin.
  2. A paint containing an acrylic resin; a painting executed using such a paint.
  1. (organic chemistry) Derived from acrylic acid or acrylonitrile.
  2. Containing an acrylic resin.
acrylic acid Tweet Definition of acrylic acid Like Definition of acrylic acid on Facebook
  1. (organic compound) A colourless liquid unsaturated organic acid, CH2CHCOOH; used as a monomer in the production of acrylic resins; forms acrylate esters by combination with alcohols.
acrylic fiber Tweet Definition of acrylic fiber Like Definition of acrylic fiber on Facebook
  1. synthetic fibers made from a polymer.
acrylic resin Tweet Definition of acrylic resin Like Definition of acrylic resin on Facebook
  1. (organic chemistry) Any of many thermoplastic or thermosetting polymers or copolymers of acrylic acid, methacrylic acid, esters of these acids, or acrylonitrile; used in paint and many plastics.
acrylonitrile Tweet Definition of acrylonitrile Like Definition of acrylonitrile on Facebook
  1. (organic compound) A toxic colourless liquid organic compound, CH2=CH.CN, synthesized from propylene and ammonia; used as a monomer in the production of acrylic resins and synthetic rubber.
actinide Tweet Definition of actinide Like Definition of actinide on Facebook
  1. (chemistry) any of the 14 radioactive elements of the periodic table that are positioned under the lanthanides to which they have similar chemistry
actinism Tweet Definition of actinism Like Definition of actinism on Facebook
noun (infl, en, noun)
  1. That property of electromagnetic radiation that leads to the production of photochemical effects
actinium Tweet Definition of actinium Like Definition of actinium on Facebook
  1. a radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores
activate Tweet Definition of activate Like Definition of activate on Facebook
verb (activat, ing)
  1. Put into action
  2. Put to work
  3. Turn on
activated carbon Tweet Definition of activated carbon Like Definition of activated carbon on Facebook
  1. (chemistry) A very absorbent form of finely powdered carbon; used in purifying gases, and as an antidote for many poisons.
activity Tweet Definition of activity Like Definition of activity on Facebook
noun (WikiSaurus?-link, activity)
(activit, ies)
  1. The state or quality of being active; nimbleness; agility; vigorous action or operation; energy; active force; as, an increasing variety of human activities.
Pit row was abuzz with activity.
  1. something done as an action or a movement
The activity for the morning was a walk to the store.
  1. something done for pleasure or entertainment, especially one involving movement or an excursion.
Quilting can be a fun activity.
  1. Use (of internet, playstation, bank account etc.)
acyclic Tweet Definition of acyclic Like Definition of acyclic on Facebook
  1. (chemistry) not cyclic; having an open chain structure
  2. (graph theory) not cyclic
acyl Tweet Definition of acyl Like Definition of acyl on Facebook
  1. (organic chemistry) A class of organic radicals, RCO-, formed by the removal of a hydroxyl group from a carboxylic acid.
acyloin Tweet Definition of acyloin Like Definition of acyloin on Facebook
  1. (organic chemistry) Any α-hydroxy ketone.
adamantane Tweet Definition of adamantane Like Definition of adamantane on Facebook
  1. (organic compound) A polycyclic hydrocarbon, C10H16, having a cagelike structure similar to a portion of the diamond lattice.
addition Tweet Definition of addition Like Definition of addition on Facebook
  1. (uncountable) The act of adding anything.
The addition of five more items to the agenda will make the meeting unbearably long.
  1. Anything that is added.
  2. (arithmetic) (uncountable) The process of adding.
addition reaction Tweet Definition of addition reaction Like Definition of addition reaction on Facebook
  1. (chemistry) a reaction in which radicals are added to both sides of a double bond, double or triple bond
adduct Tweet Definition of adduct Like Definition of adduct on Facebook
  1. (chemistry) A compound produced by the mixing of two or more chemicals.
  1. (transitive, physiology) To draw towards a common center or a middle line. - Thomas Huxley
adipic acid Tweet Definition of adipic acid Like Definition of adipic acid on Facebook
  1. (organic compound) A white crystalline di-carboxylic acid, C4H8(COOH)2; it has many industrial applications, and when condensed with hexamethylene diamine it produces nylon.
adsorbate Tweet Definition of adsorbate Like Definition of adsorbate on Facebook
  1. a substance which has been adsorbed
aerogel Tweet Definition of aerogel Like Definition of aerogel on Facebook
  1. A solid-state substance similar to gel where the liquid component is replaced with gas.
aerosol Tweet Definition of aerosol Like Definition of aerosol on Facebook
  1. A gaseous or airborne cloud of particulate matter, either as a solid, liquid, or gas, which forces another substance out of a spray can.
An was used to force the flea powder out of the can.
  1. (physical chemistry) A colloidal system in which the dispersed phase is composed of either solid or liquid particles and in which the dispersal medium is some gas, usually air.
  1. In a gaseous or airborne cloud of particulate matter, either solid, liquid, or gas
The paint came as a can of fast-drying spray.
affinity Tweet Definition of affinity Like Definition of affinity on Facebook
noun (affinities)
  1. A family relationship through marriage of a relative, as opposed to consanguinity. (e.g. sister-in-law).
  2. A kinsman or kinswoman of such relationship. Affinal kinsman or kinswoman.
  3. Any romantic relationship.
  4. Any passionate love for something.
  5. (chemistry) An attractive force between atoms, or groups of atoms, that contributes towards their forming bonds
    1. The attraction between an antibody and an antigen
AG Tweet Definition of AG Like Definition of AG on Facebook
  1. Attorney General
agarose Tweet Definition of agarose Like Definition of agarose on Facebook
  1. a polymeric cross-linked polysaccharide extracted from the seaweed agar; used to make gels that are used in electrophoresis
agent Tweet Definition of agent Like Definition of agent on Facebook
  1. One who exerts power, or has the power to act; an actor.
Heaven made us agents, free to good or ill. --Dryden.
  1. One who acts for, or in the place of, another, by authority from him; one intrusted with the business of another; a substitute; a deputy; a factor.
  2. An active power or cause; that which has the power to produce an effect; as, a physical, chemical, or medicinal agent; as, heat is a powerful agent.
  3. (computing) In the client-server model, the part of the system that performs information preparation and exchange on behalf of a client or server. Especially in the phrase “intelligent agent” it implies some kind of automatic process which can communicate with other agents to perform some collective task on behalf of one or more humans.
alabamine Tweet Definition of alabamine Like Definition of alabamine on Facebook
  1. (context, element, obsolete) Former name for chemical element astatine.
alanyl Tweet Definition of alanyl Like Definition of alanyl on Facebook
  1. (organic compound) The univalent acyl radical, CH3CH(NH2)CO-, derived from the amino acid alanine.
alcohol Tweet Definition of alcohol Like Definition of alcohol on Facebook
  1. (uncountable) An intoxicating beverage made by the fermentation of sugar or sugar-containing material.
  2. (context, organic chemistry, countable) Any of a class of organic compounds (such as ethanol) containing a hydroxyl functional group(-OH).
alcoholate Tweet Definition of alcoholate Like Definition of alcoholate on Facebook
  1. (context, obsolete, chemistry) A crystalline salt containing alcohol in place of water of crystallization.
  2. An alcoholic extract of plant material; a tincture.
  3. (organic chemistry) An alkoxide.
alcoholometer Tweet Definition of alcoholometer Like Definition of alcoholometer on Facebook
  1. A specialized form of hydrometer used to measure the amount of alcohol in a liquid (such as beer)
alcoholysis Tweet Definition of alcoholysis Like Definition of alcoholysis on Facebook
  1. (chemistry) solvolysis using an alcohol
aldehyde Tweet Definition of aldehyde Like Definition of aldehyde on Facebook
  1. (organic chemistry) Any of a large class of reactive organic compounds (R·CHO) having a carbonyl functional group attached to one hydrocarbon radical and a hydrogen atom.
aldose Tweet Definition of aldose Like Definition of aldose on Facebook
  1. (context, organic chemistry, carbohydrate) Any of a class of monosaccharides having an aldehyde or hemiacetal functional group.
alginic acid Tweet Definition of alginic acid Like Definition of alginic acid on Facebook
  1. a gum (a carboxylated polysaccharide), extracted from certain seaweeds, used as a food additive
alicyclic Tweet Definition of alicyclic Like Definition of alicyclic on Facebook
  1. (organic chemistry) Of a class of organic compounds having both aliphatic (chain) and cyclic (ring) structure.
aliphatic Tweet Definition of aliphatic Like Definition of aliphatic on Facebook
  1. (organic chemistry) Of a class of organic compounds in which the carbon atoms are arranged in an open chain.
alkali Tweet Definition of alkali Like Definition of alkali on Facebook
noun (alkal, ies, pl2=alkalis)
  1. Soda ash; caustic soda, caustic potash, etc.
  2. (Chemistry) One of a class of caustic bases, such as soda, potash, ammonia, and lithia, whose distinguishing peculiarities are solubility in alcohol and water, uniting with oils and fats to form soap, neutralizing and forming salts with acids, turning to brown several vegetable yellows, and changing reddened litmus to blue.
    1. (Western United States) Soluble mineral matter, other than common salt, contained in soils of natural waters.
alkalimeter Tweet Definition of alkalimeter Like Definition of alkalimeter on Facebook
  1. A device used to measure alkalinity
alkaline Tweet Definition of alkaline Like Definition of alkaline on Facebook
  1. Of, or relating to an alkali.
  2. (chemistry) Having a pH greater than 7
alkalinity Tweet Definition of alkalinity Like Definition of alkalinity on Facebook
noun (alkalinities)
  1. (chemistry) The state of being, or the degree to which a thing is, alkaline.
alkalize Tweet Definition of alkalize Like Definition of alkalize on Facebook
verb (alkaliz, ing)
  1. To cause to become more basic and less acidic.
alkane Tweet Definition of alkane Like Definition of alkane on Facebook
  1. (organic chemistry) Any of saturated hydrocarbons including methane, ethane and compounds with long carbon chain known as paraffins etc., having a chemical formula of the form CnH2n+2.
alkene Tweet Definition of alkene Like Definition of alkene on Facebook
  1. (organic chemistry) An unsaturated, aliphatic hydrocarbon with one or more carbon-carbon double bonds.
alkoxide Tweet Definition of alkoxide Like Definition of alkoxide on Facebook
  1. (organic chemistry) Any organic compound derived from an alcohol by replacement of a hydrogen atom with a metal or other cationic species.
alkoxy Tweet Definition of alkoxy Like Definition of alkoxy on Facebook
  1. (chemistry) any univalent radical R-O-, or anion R-O-, where R is an alkyl group
alkyd Tweet Definition of alkyd Like Definition of alkyd on Facebook
  1. A synthetic resin derived from a reaction between alcohol and certain acids, used as a base for many laminates, paints and coatings.
alkyl Tweet Definition of alkyl Like Definition of alkyl on Facebook
  1. (organic chemistry) Any of a series of univalent radicals of the general formula CnH2n+1 derived from aliphatic hydrocarbons.
alkyne Tweet Definition of alkyne Like Definition of alkyne on Facebook
  1. (organic chemistry) A hydrocarbon containing at least one carbon-carbon triple bond.
allomorph Tweet Definition of allomorph Like Definition of allomorph on Facebook
  1. (chemistry) any of the different crystalline forms of a substance
  2. (linguistics) any of the different phonological representations of a morpheme
allotrope Tweet Definition of allotrope Like Definition of allotrope on Facebook
  1. (chemistry) Any form of an element that has a distinctly different molecular structure to another form of the same element.
    • Ozone (O3) is an of oxygen, normally O2
    • Note: Different structural forms of a compound are isomers.
allotropic Tweet Definition of allotropic Like Definition of allotropic on Facebook
  1. (chemistry) Describing a form of an element that exhibits allotropy.
    • Graphite and diamond are forms of carbon.
allotropy Tweet Definition of allotropy Like Definition of allotropy on Facebook
noun uncountable
  1. (chemistry) A property, exhibited by some elements of existing in multiple forms with different atomic structures.
allyl Tweet Definition of allyl Like Definition of allyl on Facebook
  1. (organic chemistry) An organic radical, C3H5, existing especially in oils of garlic and mustard.
alpha Tweet Definition of alpha Like Definition of alpha on Facebook
  1. The name of the first letter of the Greek alphabet (Î�,  Î±), followed by beta. In the Latin alphabet it is the predecessor to A.
  2. (context, science) The name of the symbol, symbols � and α used in science and mathematics, often interchangeable with the symbols when used as a prefix.
: alpha particle ("α-particle")
  1. The highest scientific caste of people in the novel w:Brave New World, Brave New World by w:Aldous Huxley, Aldous Huxley.
  2. In finance, the amount by which a given asset or portfolio's return exceeds a "riskless" rate of return.
  1. Designates the first in an order of precedence.
alpha male, male
  1. (star) Designates the brightest star in a constellation.
Alpha Centauri, Alpha Centauri
aludel Tweet Definition of aludel Like Definition of aludel on Facebook
  1. a pear-shaped pot with an opening at each end, formerly used for sublimation.
alum Tweet Definition of alum Like Definition of alum on Facebook
  1. (chemistry) A double sulphate formed of aluminum and some other element (especially an alkali metal) or of ammonium.
alumina Tweet Definition of alumina Like Definition of alumina on Facebook
  1. A name for aluminium oxide used especially in mining, material sciences and ceramics.
aluminate Tweet Definition of aluminate Like Definition of aluminate on Facebook
  1. (chemistry) A compound, containing aluminium and oxygen with more electropositive elements, that is a salt of the hypothetical aluminic acid
aluminiferous Tweet Definition of aluminiferous Like Definition of aluminiferous on Facebook
  1. containing, or yielding aluminum or its ore
aluminum Tweet Definition of aluminum Like Definition of aluminum on Facebook
  1. A metallic chemical element (symbol Al) with an atomic number of 13.
aluminum chloride Tweet Definition of aluminum chloride Like Definition of aluminum chloride on Facebook
  1. (inorganic compound) Alternative spelling of aluminium chloride.
aluminum hydroxide Tweet Definition of aluminum hydroxide Like Definition of aluminum hydroxide on Facebook
  1. alternative spelling of aluminium hydroxide
AM Tweet Definition of AM Like Definition of AM on Facebook
  1. (Sometimes lower case) From Latin ante meridiem, meaning "before noon (12:00)".
    • See also: A.M.
      1. Amplitude Modulation
    • Contrasted with FM
      1. Assembly Member, a title similar to MP, placed after the name of a Member of the Welsh National Assembly.
      2. Artium Magister or Master of Arts
amaranth Tweet Definition of amaranth Like Definition of amaranth on Facebook
  1. any of various trees, of the genus Amaranthus
  2. the seed of these plants, used as a cereal
  3. a red to purple azo dye used as a food colouring and in cosmetics
americium Tweet Definition of americium Like Definition of americium on Facebook
  1. (element) The chemical element (symbol Am) with an atomic number of 95.
amic Tweet Definition of amic Like Definition of amic on Facebook
  1. (context, obsolete, chemistry) Of, relating to, or derived from ammonia.
  2. (chemistry) Of, relating to, or derived from an amine, amide or amic acid.
amide Tweet Definition of amide Like Definition of amide on Facebook
  1. (organic chemistry) Any derivative of an oxoacid in which the hydroxyl group has been replaced with an amino or substituted amino group; especially such derivatives of a carboxylic acid, the carboxamides.
  2. (inorganic chemistry) Any ionic derivative of ammonia in which a hydrogen atom has been replaced with a metal cation.
amidine Tweet Definition of amidine Like Definition of amidine on Facebook
  1. (chemistry) any of several classes of organic compound, formally derived from oxoacids, by replacement of the hydroxy group with an amino group, and the oxo group with =NR
    • i.e RnX(=O)OH => RnX(=NR)NR2 where X is C, S, P etc
amine Tweet Definition of amine Like Definition of amine on Facebook
  1. (inorganic chemistry) A functional group formally derived from ammonia by replacing one, two or three hydrogen atoms with hydrocarbon or other radicals.
  2. (organic chemistry) Any organic compound containing an amine functional group.
amino Tweet Definition of amino Like Definition of amino on Facebook
  1. (chemistry) The amine functional group.
  1. (chemistry) Relating to an amine.
ammonia Tweet Definition of ammonia Like Definition of ammonia on Facebook
  1. (inorganic compound) A gaseous compound of hydrogen and nitrogen, NH3, with a pungent smell and taste.
ammonium Tweet Definition of ammonium Like Definition of ammonium on Facebook
  1. (inorganic chemistry) The univalent NH4+ cation, derived by the protonation of ammonia.
ammonium carbonate Tweet Definition of ammonium carbonate Like Definition of ammonium carbonate on Facebook
  1. (chemical compound) The ammonium salt of carbonic acid, (NH4)2CO3; a white powder, smelling of ammonia, used in the preparation of smelling salts and baking powder.
ammonium chloride Tweet Definition of ammonium chloride Like Definition of ammonium chloride on Facebook
  1. (chemical compound) A water-soluble salt of ammonia and hydrochloric acid, having the formula NH4Cl.
ammonium hydroxide Tweet Definition of ammonium hydroxide Like Definition of ammonium hydroxide on Facebook
  1. (chemical compound) The ionic base, NH4+OH-, obtained by dissolving ammonia in water.
amorphous Tweet Definition of amorphous Like Definition of amorphous on Facebook
  1. lacking a definite form or clear shape
The enormous pile of spaghetti landed in an amorphous heap on the floor.
  1. being without definite character or nature
  2. lacking organization or unity
  3. (physics) A state of solid that is not in crystal and its regular structure is crystal.
amphoteric Tweet Definition of amphoteric Like Definition of amphoteric on Facebook
  1. (chemistry) Having the characteristics of both an acid and a base, and capable of reacting as either; amphiprotic.
amyl Tweet Definition of amyl Like Definition of amyl on Facebook
  1. (organic chemistry) A hydrocarbon radical, C5H11, of the paraffine series found in amyl alcohol or fusel oil, etc.
amyl alcohol Tweet Definition of amyl alcohol Like Definition of amyl alcohol on Facebook
  1. (organic compound) Any of the isomers of pentanol, C5H11OH; the principal constituent of fusel oil.
analogue Tweet Definition of analogue Like Definition of analogue on Facebook
  1. (countable) Something that bears an analogy to something else.
  2. (countable) (Biology) An organ or structure that is similar in function to one in another kind of organism but is of dissimilar evolutionary origin.
  3. (chemistry) A structural derivative of a parent compound that often differs from it by a single element.
  1. (notcomparable) (Of a device or system) in which the value of a data item (such as time) is represented by a continuously variable physical quantity that can be measured (such as the shadow of a sundial)
anhydride Tweet Definition of anhydride Like Definition of anhydride on Facebook
  1. (chemistry) any compound formally derived from another (or from others) by the loss of a water molecule, especially acid anhydrides
anhydrous Tweet Definition of anhydrous Like Definition of anhydrous on Facebook
  1. having little or no water
  1. (chemistry) having no water of crystallization
anilide Tweet Definition of anilide Like Definition of anilide on Facebook
  1. (organic chemistry) Any organic compound derived from an oxoacid by replacement of a hydroxyl group by an aniline residue; an amide of aniline.
  2. (organic chemistry) Any compound in which one of the nitrogen-bound hydrogen atoms of aniline is replaced by a metal or other cation.
aniline Tweet Definition of aniline Like Definition of aniline on Facebook
  1. (organic compound) A colourless oily basic poisonous liquid used in the manufacture of dyes and pharmaceuticals.
  2. (organic compound) The simplest aromatic amine, C6H5NH2, synthesized by the reduction of nitrobenzene.
anion Tweet Definition of anion Like Definition of anion on Facebook
  1. An electronegative element, or the element which, in electro-chemical decompositions, is evolved at the anode; -- opposed to cation.
anthracene Tweet Definition of anthracene Like Definition of anthracene on Facebook
  1. (organic compound) A tricyclic aromatic hydrocarbon (an acene containing three fused rings) obtained from coal tar; used in the manufacture of wood preservatives, insecticides and the dye alizarin; it is isomeric with phenanthrene.
anthraquinone Tweet Definition of anthraquinone Like Definition of anthraquinone on Facebook
  1. (organic compound) A tricyclic quinone, derived from anthracene.
  2. (organic chemistry) Any derivative of this parent compound, mostly natural pigments or synthetic dyes.
antichlor Tweet Definition of antichlor Like Definition of antichlor on Facebook
  1. (chemistry) Any substance used to remove excess chlorine or hypochlorite from textiles etc after bleaching; typically sodium thiosulfite
antimonate Tweet Definition of antimonate Like Definition of antimonate on Facebook
  1. (inorganic chemistry) Any salt or ester of antimonic acid.
antimonic Tweet Definition of antimonic Like Definition of antimonic on Facebook
  1. Of or containing antimony.
  2. (inorganic chemistry) Containing trivalent antimony.
antimonic acid Tweet Definition of antimonic acid Like Definition of antimonic acid on Facebook
  1. (inorganic compound) The antimony analogue of phosphoric acid, H3SbO?4
antimonide Tweet Definition of antimonide Like Definition of antimonide on Facebook
  1. (inorganic chemistry) Any compound of antimony with more electropositive elements.
antimonous Tweet Definition of antimonous Like Definition of antimonous on Facebook
  1. (inorganic chemistry) (alternative form of, antimonious)
antioxidant Tweet Definition of antioxidant Like Definition of antioxidant on Facebook
  1. any substance that acts to slow or prevent the oxidation of another chemical
  2. in nutrition, one of a group of vitamins that act against the effects of free radicals
  1. acting or havirng agents that act against oxidation
aqua fortis Tweet Definition of aqua fortis Like Definition of aqua fortis on Facebook
noun (abbreviated A.F.)
  1. (context, inorganic compound, obsolete) An old name for nitric acid.
  2. (alchemy) A corrosive liquor made of saltpeter, serving as a solvent for dissolving silver and all other metals except gold.
aqua regia Tweet Definition of aqua regia Like Definition of aqua regia on Facebook
noun (abbreviation A.R.)
  1. An extremely powerful acid mixture composed of three parts concentrated hydrochloric acid to one part concentrated nitric acid.
arachidic acid Tweet Definition of arachidic acid Like Definition of arachidic acid on Facebook
  1. (fatty acid) A long-chain fatty acid, CH3(CH2)18COOH, found in groundnut oil; it has a melting point of 75.4 °C
argentic Tweet Definition of argentic Like Definition of argentic on Facebook
  1. Of, pertaining to or containing silver.
  2. (chemistry) Of certain compounds, containing silver in a lower proportion than in argentous compounds.
argentous Tweet Definition of argentous Like Definition of argentous on Facebook
  1. Of, pertaining to or containing silver.
  2. (chemistry) Of certain compounds, containing silver in a higher proportion than in argentic compounds.
argon Tweet Definition of argon Like Definition of argon on Facebook
  1. a chemical element (symbol Ar) with an atomic number of 18.
aromatic Tweet Definition of aromatic Like Definition of aromatic on Facebook
  1. A fragrant plant or spice added to a dish to flavour it.
  1. fragrant, Fragrant or spicy.
  2. (organic chemistry) Having a closed ring of alternate single and double bonds; derivatives of the hydrocarbon, benzene.
aromatic compound Tweet Definition of aromatic compound Like Definition of aromatic compound on Facebook
  1. (organic chemistry) Any compound which exhibits aromaticity.
aromaticity Tweet Definition of aromaticity Like Definition of aromaticity on Facebook
  1. (organic chemistry) The property of organic compounds which have at least one conjugated ring of alternate single, single bond and double bonds, and exhibit extreme stability.
arsenate Tweet Definition of arsenate Like Definition of arsenate on Facebook
  1. (chemistry) Any salt or ester of arsenic acid.
  2. (chemistry) The anion AsO?43-.
arsenic Tweet Definition of arsenic Like Definition of arsenic on Facebook
  1. A nonmetallic chemical element (symbol As) with an atomic number of 33.
  2. arsenic trioxide, Arsenic trioxide.
  1. Of, or containing arsenic with a valence of 5.
arsenic acid Tweet Definition of arsenic acid Like Definition of arsenic acid on Facebook
  1. (chemical compound) A poisonous, white crystalline compound, H3AsO?4, formed from arsenic pentoxide and water; it has the same structure as phosphoric acid, and is used in the manufacture of arsenates.
arsenide Tweet Definition of arsenide Like Definition of arsenide on Facebook
  1. arsenide ion; an arsenic atom with three extra electrons and charge −3
  2. a compound with arsenic in oxidation state −3.
arsenious Tweet Definition of arsenious Like Definition of arsenious on Facebook
  1. of, or containing arsenic with a valence of 3
arseniuretted hydrogen Tweet Definition of arseniuretted hydrogen Like Definition of arseniuretted hydrogen on Facebook
  1. (context, obsolete, chemical compound) The compound arsine.
arsenous Tweet Definition of arsenous Like Definition of arsenous on Facebook
  1. (chemistry) of, related to, or derived from arsenic, especially in an oxidation state of three; arsenious
arsine Tweet Definition of arsine Like Definition of arsine on Facebook
  1. (context, chemical compound, uncountable) A compound of arsenic and hydrogen, AsH?3, a colorless and exceedingly poisonous gas, having an odor like garlic.
  2. (context, organic chemistry, countable) Any organic derivative of this compound, or of diarsane, triarsane etc.
aryl Tweet Definition of aryl Like Definition of aryl on Facebook
  1. (organic chemistry) Any univalent organic radical derived from an aromatic hydrocarbon by removing a hydrogen atom.
AS Tweet Definition of AS Like Definition of AS on Facebook
  1. Anglo-Saxon
  2. Advanced Supplementary
  3. (neurology) Asperger's Syndrome
  4. (geography) American Samoa
asafetida Tweet Definition of asafetida Like Definition of asafetida on Facebook
  1. (alternative spelling of, asafoetida)
asphalt Tweet Definition of asphalt Like Definition of asphalt on Facebook
  1. A sticky, black and highly viscous liquid or semi-solid that is present in most crude petroleums and in some natural deposits. Asphalt is composed almost entirely of bitumen.
  2. Often used as an abbreviation for asphalt concrete. A hard ground covering used for roads and walkways
(wikipedia, asphalt concrete)      
association Tweet Definition of association Like Definition of association on Facebook
  1. The act of associating.
  2. The state of being associated.
  3. A group of persons associated for a common purpose; an organization; society.
  4. A connection to or an affiliation with something.
astatine Tweet Definition of astatine Like Definition of astatine on Facebook
  1. (element) A highly radioactive chemical element (symbol At) with atomic number 85 and one of the halogens.
atmosphere Tweet Definition of atmosphere Like Definition of atmosphere on Facebook
noun (wikipedia, atmosphere, Atmosphere (layer of gases))
  1. The gases surrounding the Earth or any astronomical body.
  2. The air in a particular place.
  3. The mood or feeling in a situation.
atomic Tweet Definition of atomic Like Definition of atomic on Facebook
  1. Of, or relating to atoms
    • A stream of hydrogen is emitted
      1. Of, or employing nuclear energy or processes
    • We built a small bomb in the garage
      1. Infinitesimally small
    • The hairs on a bedbug are almost
      1. Unable to be split or made any smaller
    • A bit is an item of data
atomicity Tweet Definition of atomicity Like Definition of atomicity on Facebook
noun (atomicities)
  1. (uncountable) the abstract state of being atomic (that is, of being indivisible)
  2. f5fe5b4cd9f4da2a
  • (chemistry) the number of atoms in a molecule
  • (computing) the state of a system (often a database system) in which either all stages complete or none complete
    atomic number Tweet Definition of atomic number Like Definition of atomic number on Facebook
    1. (chemistry) The number, equal to the number of protons in an atom that determines its chemical properties. Symbol: Z
    atomic weight Tweet Definition of atomic weight Like Definition of atomic weight on Facebook
    1. Former term for the more specific relative atomic mass.
    2. A term used to represent the mean relative atomic mass of an element in nature, as distinct from the relative atomic mass of a single isotope.
    AU Tweet Definition of AU Like Definition of AU on Facebook
    1. astronomical unit
    2. Australia
    3. African Union
    auric Tweet Definition of auric Like Definition of auric on Facebook
    1. (inorganic chemistry) Containing trivalent gold.
    2. (obsolete) Of, or pertaining to the ear; aural
    aurous Tweet Definition of aurous Like Definition of aurous on Facebook
    1. Relating to gold.
    2. Containing gold.
    3. (inorganic chemistry) Containing univalent gold.
    Aurum Tweet Definition of Aurum Like Definition of Aurum on Facebook
    proper noun 
    1. a sweet Italian liqueur, having a golden yellow colour, manufactured from brandy, oranges and saffron
    autoclave Tweet Definition of autoclave Like Definition of autoclave on Facebook
    1. A strong, pressurized, heated vessel, as for laboratory experiments, sterilization, cooking or mineral processing.
    1. (transitive) To sterilize laboratory equipment in an .
    auxochrome Tweet Definition of auxochrome Like Definition of auxochrome on Facebook
    1. (obsolete),(chemistry) any atom or group which, when added to a chromophore, causes a bathochromic shift in its spectrum
    Avogadro's number Tweet Definition of Avogadro Like Definition of Avogadro
    1. (context, chemistry, physics) The number of atoms present in 0.012 kilograms of isotopically pure Carbon-12, being 6.0221415 x 1023. By definition, the number of elementary entity, entities (atoms or molecules) comprising one mole of a given substance.
    azeotrope Tweet Definition of azeotrope Like Definition of azeotrope on Facebook
    1. (context, physical chemistry, physics) A mixture of two or more substances whose liquid and gaseous forms have the same composition (at a certain pressure); the substances cannot be separated by normal distillation.
    azide Tweet Definition of azide Like Definition of azide on Facebook
    1. (chemistry) the univalent N3 radical or functional group or any ester containing this group
    2. (chemistry) the N3- anion or any salt containing this anion
    azine Tweet Definition of azine Like Definition of azine on Facebook
    1. (organic chemistry) Any of a class of organic compounds, having the general formula R2C=NN=CR2, produced by the action of a carbonyl compound with hydrazine.
    azo Tweet Definition of azo Like Definition of azo on Facebook
    1. azote, nitrogen
    2. Applied loosely to compounds having nitrogen variously combined, as in cyanides, nitrates, etc.
    3. Now especially applied to compounds containing a two atom nitrogen group uniting two hydrocarbon radicals, as in azobenzene etc.
    azobenzene Tweet Definition of azobenzene Like Definition of azobenzene on Facebook
    1. (chemistry) an aromatic azo compound, di-phenyl diazene, the basis of many dyes
    azo dye Tweet Definition of azo dye Like Definition of azo dye on Facebook
    1. (chemistry) any of a large number of yellow to red synthetic dyes that contain an azo or diimide (-N=N-) functional group
    azote Tweet Definition of azote Like Definition of azote on Facebook
    1. (archaic) Nitrogen.
    azotic Tweet Definition of azotic Like Definition of azotic on Facebook
    1. (context, chemistry, obsolete) Pertaining to azote, or nitrogen; formed or consisting of azote; as, azotic gas; azotic acid.
    2. (obsolete) Fatal to animal life.
    azotize Tweet Definition of azotize Like Definition of azotize on Facebook
    verb (azotiz, ing)
    1. (transitive) (obsolete) To impregnate with azote (nitrogen).

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