All Words Glossary

Glossary of Chemistry Terms
beginning with letter E
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Earth Tweet Definition of Earth Like Definition of Earth on Facebook
proper noun
  1. The third planet in order from the Sun, upon which humans live; represented in astronomy and astrology by and ⊕.
elastomer Tweet Definition of elastomer Like Definition of elastomer on Facebook
  1. any polymer having the elastic properties of rubber
elective Tweet Definition of elective Like Definition of elective on Facebook
  1. Of, or pertaining to voting or elections
  2. That involves a choice between options; optional or discretionary
electrolysis Tweet Definition of electrolysis Like Definition of electrolysis on Facebook
  1. (chemistry) the chemical change produced by passing an electric current through a conducting solution or a molten salt
  2. the destruction of hair roots by means of an electric current
electrolytic Tweet Definition of electrolytic Like Definition of electrolytic on Facebook
  1. of, relating to, or using electrolysis
electronegative Tweet Definition of electronegative Like Definition of electronegative on Facebook
  1. having a negative electric charge
  1. (chemistry) tending to attract electrons to form a chemical bond
electrophilic Tweet Definition of electrophilic Like Definition of electrophilic on Facebook
  1. (chemistry) of, or relating to an electrophile; electron deficient
electrophoresis Tweet Definition of electrophoresis Like Definition of electrophoresis on Facebook
  1. the migration of electrically charged molecules through a medium under the influence of an electric field
  2. a method for the separation and analysis of large molecules (such as proteins) by migrating a colloidal solution of them through a gel; gel electrophoresis
electropositive Tweet Definition of electropositive Like Definition of electropositive on Facebook
  1. having a positive electric charge
  1. (chemistry) tending to release electrons to form a chemical bond
element Tweet Definition of element Like Definition of element on Facebook
  1. (chemistry) Any one of the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means and made up of atoms all having the same number of protons.
  2. One of the four basic building blocks of matter in theories of ancient philosophers and alchemists: water, earth, fire, and air.
  3. Something small.
an of doubt
  1. A place or state of being that an individual or object is better suited towards.
be in one's own
  1. A required aspect or component of a cause of action. A deed is regarded a violation of law only if each element can be proved.
  2. (set theory) One of the objects in a set.
  3. A group of people within a larger group having a particular common characteristic.
You sometimes find the hooligan at football matches.
  1. A short form of heating element, a component in electrical equipment, often in the form of a coil, having a high resistance, thereby generating heat when a current is passed through it.
The in this electric kettle can heat the water in under a minute.
elementary Tweet Definition of elementary Like Definition of elementary on Facebook
  1. Relating to the basic, essential or fundamental part of something.
  2. Relating to an elementary school.
  3. (physics) Relating to a subatomic particle.
eluate Tweet Definition of eluate Like Definition of eluate on Facebook
  1. A liquid solution that results from elution.
elute Tweet Definition of elute Like Definition of elute on Facebook
verb (elut, ing)
  1. (transitive) The act of separating one substance from another by means of a solvent; to wash; to cleanse.
A mixture of isooctane and ethyl acetate can be used to triglycerides from a complex lipid solution.
elutriate Tweet Definition of elutriate Like Definition of elutriate on Facebook
  1. to decant; to purify something by straining it
emanation Tweet Definition of emanation Like Definition of emanation on Facebook
  1. The act of flowing or proceeding from a fountain head or origin.
  2. That which issues, flows, or proceeds from any object as a source; efflux; an effluence; as, perfume is an emanation from a flower.
empirical formula Tweet Definition of empirical formula Like Definition of empirical formula on Facebook
  1. (chemistry) A notation indicating the ratios of the various elements present in a compound, without regard to the actual numbers.
The molecular formula for ethane is C2H6, while the is CH3.
emulsion Tweet Definition of emulsion Like Definition of emulsion on Facebook
  1. a stable suspension of small droplets of one liquid in another with which it is immiscible
mayonnaise, Mayonnaise is an where egg is used to keep oil and water mixed.
  1. (chemistry) a colloid in which both phases are liquid
  2. the coating of photosensitive silver halide grains in a thin gelatine layer on a photographic film
enantiomer Tweet Definition of enantiomer Like Definition of enantiomer on Facebook
  1. (chemistry) One of a pair of stereoisomers that is the mirror image of the other, but may not be superimposed on this other stereoisomer. Almost always, a pair of enantiomers contain at least one chiral centre, and a sample of either enantiomer will be optically active.
endoergic Tweet Definition of endoergic Like Definition of endoergic on Facebook
  1. (physics),(chemistry) occuring with the absorption of energy; endothermic
endosmosis Tweet Definition of endosmosis Like Definition of endosmosis on Facebook
  1. osmosis in which fluid flows through a membrane towards a region of higher concentration
endothermic Tweet Definition of endothermic Like Definition of endothermic on Facebook
  1. (chemistry): Of a chemical reaction that absorbs heat energy from its surroundings.
  2. (zoology): Of an animal whose body temperature is regulated by internal factors.
enol Tweet Definition of enol Like Definition of enol on Facebook
  1. (organic chemistry) An organic compound containing a hydroxyl group bonded to a carbon atom, which is doubly bonded to another carbon atom.
enolate Tweet Definition of enolate Like Definition of enolate on Facebook
  1. (chemistry) any metal salt of the enol form of a tautomeric aldehyde or ketone
entrain Tweet Definition of entrain Like Definition of entrain on Facebook
  1. (poetic) To get into or board a train.
  2. (chemistry) To suspend small particles in the current of a fluid.
  3. (figurative) To encarriage, to conjoin, to link; as in a series of entities, elements, objects or processes.
epichlorohydrin Tweet Definition of epichlorohydrin Like Definition of epichlorohydrin on Facebook
  1. (chemistry) any epihalohydrin in which the halogen is chlorine
epimer Tweet Definition of epimer Like Definition of epimer on Facebook
  1. (chemistry) any diastereoisomer that has the opposite configuration at only one of the stereogenic centres
epoxide Tweet Definition of epoxide Like Definition of epoxide on Facebook
  1. (organic chemistry) Any of a class of organic compound, cyclic ethers, having a three-membered ring; they are prepared by the selective oxidation of alkenes or by ring-closure of halohydrins; used to make plastics.
epoxy Tweet Definition of epoxy Like Definition of epoxy on Facebook
noun (epox, ies)
  1. A thermosetting resin used chiefly in strong adhesives, coatings and laminates; epoxy resin.
  1. (chemistry) Derived from an epoxide.
equation Tweet Definition of equation Like Definition of equation on Facebook
  1. (math) An assertion that two expressions are equal, expressed by writing the two expressions separated by an equal sign; from which one is to determine a particular quantity.
equilibrium Tweet Definition of equilibrium Like Definition of equilibrium on Facebook
noun (pluralequilibria)
  1. The condition of a system in which competing influences are balanced.
  2. (physics) The state of a body at rest or in uniform motion in which the resultant of all forces on it is zero.
  3. (chemistry) The state of a reaction in which the rates of the forward and reverse reactions are the same.
  4. Mental balance.
equivalence Tweet Definition of equivalence Like Definition of equivalence on Facebook
  1. The condition of being equivalent or essentially equal.
  1. (mathematics) An equivalence relation.
  2. (logic) The relationship between two propositions that are either both true or both false.
equivalent Tweet Definition of equivalent Like Definition of equivalent on Facebook
  1. anything that is virtually equal to another
  2. (chemistry) an equivalent weight
  1. similar or identical in value, meaning or effect; virtually equal
  2. (mathematics) of two sets, having a one-to-one relationship
  3. (mathematics) relating to the corresponding elements of an equivalence relation
  4. (chemistry) having the equal ability to combine
  5. (cartography) of a map, equal-area
equivalent weight Tweet Definition of equivalent weight Like Definition of equivalent weight on Facebook
  1. (chemistry) the atomic weight of an element or radical divided by its valence; the molecular weight of a compound divided by its combining power in a specific reaction
erucic acid Tweet Definition of erucic acid Like Definition of erucic acid on Facebook
  1. a long chain unsaturated fatty acid, CH3(CH2)7CH=CH(CH2)11COOH, found in rapeseed and mustard seed oils; the cis- isomer is erucic acid, the trans- isomer is brassidic acid
erythorbate Tweet Definition of erythorbate Like Definition of erythorbate on Facebook
  1. (chemistry) any salt or ester of erythorbic acid
erythorbic acid Tweet Definition of erythorbic acid Like Definition of erythorbic acid on Facebook
  1. (chemistry) a stereoisomer of ascorbic acid that does not occur naturally
ester Tweet Definition of ester Like Definition of ester on Facebook
  1. (organic chemistry) A compound most often formed by the condensation of an alcohol and an acid, with elimination of water. It contains the functional group carbon-oxygen double bond joined via carbon to another oxygen atom.
esterify Tweet Definition of esterify Like Definition of esterify on Facebook
verbto esterify
  1. (chemistry) (of an acid) to combine with an alcohol or (of an alcohol) to combine with an acid, to form an ester
ET Tweet Definition of ET Like Definition of ET on Facebook
  1. Eastern Time (synonyms: EST, Eastern Standard Time, EDT. Eastern Daylight Time)
  2. extraterrestrial
ethane Tweet Definition of ethane Like Definition of ethane on Facebook
  1. (organic compound) An aliphatic hydrocarbon, C2H6, gaseous at normal temperatures and pressures, being a constituent of natural gas.
ethanol Tweet Definition of ethanol Like Definition of ethanol on Facebook
  1. (organic compound) A simple aliphatic alcohol derived from ethane: CH3-CH2-OH
ethanolamine Tweet Definition of ethanolamine Like Definition of ethanolamine on Facebook
  1. (chemistry) a hydroxy-amine, HO.CH2.CH2.NH2, manufactured by the reaction of ethylene oxide with ammonia; it is found naturally in a combined form in cephalin, and has many industrial applications
ethene Tweet Definition of ethene Like Definition of ethene on Facebook
  1. (organic compound) The official IUPAC name for the organic chemical compound ethylene. The simplest alkene, a colorless gaseous (at room temperature and pressure) hydrocarbon with the chemical formula C2H4.
ethereal Tweet Definition of ethereal Like Definition of ethereal on Facebook
  1. Pertaining to the hypothetical upper, purer air, or to the higher regions beyond the earth or beyond the atmosphere; celestial; as, ethereal space; ethereal regions.
    • 1667: w: John Milton, Milton, Paradise Lost, book VII
    • : Go, heavenly guest, messenger.
    • 1862: w:Henry David Thoreau, Thoreau, Walking.
    • : I trust that we shall be more imaginative, that our thoughts will be clearer, fresher, and more , as our sky,...
      1. Consisting of ether; hence, exceedingly light or airy; tenuous; spiritlike; characterized by extreme delicacy, as form, manner, thought, etc.
    • 1733: w:Alexander Pope, Pope, An Essay on Man
    • : Vast chain of being, which from God began, Natures , human, angel, man.
    • Delicate, light and airy.
ethoxide Tweet Definition of ethoxide Like Definition of ethoxide on Facebook
  1. (chemistry) the anion CH3CH2O− derived from ethanol by the loss of a proton
  2. (chemistry) any salt of this anion
ethyl Tweet Definition of ethyl Like Definition of ethyl on Facebook
  1. Is a univalent, hydrocarbon radical of the paraffin series, forming the essential radical of ethane, and of common alcohol and ether.
ethyl alcohol Tweet Definition of ethyl alcohol Like Definition of ethyl alcohol on Facebook
  1. (organic compound) Older name for ethanol, a type of alcohol.
ethylamine Tweet Definition of ethylamine Like Definition of ethylamine on Facebook
  1. (chemistry) a colourless, volatile liquid amine, CH3.CH2.NH2 having many industrial applications
ethylene Tweet Definition of ethylene Like Definition of ethylene on Facebook
  1. (organic compound) The common name for the organic chemical compound ethene. The simplest alkene, a colorless gaseous (at room temperature and pressure) hydrocarbon with the chemical formula C2H4.
  2. (organic chemistry) The divalent radical derived from ethane.
ethylene glycol Tweet Definition of ethylene glycol Like Definition of ethylene glycol on Facebook
  1. (organic compound) An organic compound, HO-CH2-CH2-OH, and the chemical structure at right. It is a clear, colorless liquid under normal conditions, and is widely used as a vehicle engine coolant due to its anti-freeze properties.
ethylene oxide Tweet Definition of ethylene oxide Like Definition of ethylene oxide on Facebook
  1. (organic compound) The simplest epoxide; used as a sterilizing agent and in the production of ethylene glycol.
ethyl mercaptan Tweet Definition of ethyl mercaptan Like Definition of ethyl mercaptan on Facebook
  1. (chemistry) a thiol formally derived from ethyl alcohol by replacing the oxygen atom with sulfur
ethyne Tweet Definition of ethyne Like Definition of ethyne on Facebook
  1. (organic compound) The official IUPAC name for the organic chemical compound acetylene. The simplest alkyne, a colorless gaseous (at room temperature and pressure) hydrocarbon with the chemical formula C2H2.
EU Tweet Definition of EU Like Definition of EU on Facebook
  1. (economics) European Union
eutectic Tweet Definition of eutectic Like Definition of eutectic on Facebook
(Physics) Of maximum fusibility;—said of an alloy or mixture which has the lowest melting point which it is possible to obtain by the combination of the given components.
exaltation Tweet Definition of exaltation Like Definition of exaltation on Facebook
  1. The act of exalt, exalting or raising high; also, the state of being exalted; elevation.
  2. The refinement or subtilization of a body, or the increasing of its virtue or principal property.
  3. That placement of a planet in the zodiac in which it is deemed to exert its strongest influence.
exoergic Tweet Definition of exoergic Like Definition of exoergic on Facebook
  1. (context, physics, chemistry) Occuring with the release of energy.
exosmosis Tweet Definition of exosmosis Like Definition of exosmosis on Facebook
  1. osmosis in which fluid flows through a membrane towards a region of lower concentration
exothermic Tweet Definition of exothermic Like Definition of exothermic on Facebook
  1. (chemistry) Of a chemical reaction that releases energy in the form of heat.
  2. (zoology) Of an animal whose body temperature is regulated by external factors.
extract Tweet Definition of extract Like Definition of extract on Facebook
  1. That which is extracted or drawn out.
  2. A portion of a book or document, separately transcribed; a citation; a quotation.
  3. A decoction, solution, or infusion made by drawing out from any substance that which gives it its essential and characteristic virtue; essence; as, extract of beef; extract of dandelion; also, any substance so extracted, and characteristic of that from which it is obtained; as, quinine is the most important extract of Peruvian bark.
  4. A solid preparation obtained by evaporating a solution of a drug, etc., or the fresh juice of a plant; -- distinguished from an abstract.
  5. A peculiar principle once erroneously supposed to form the basis of all vegetable extracts; -- called also the extractive principle.
  6. Extraction; descent.
  7. A draught or copy of writing; certified copy of the proceedings in an action and the judgement therein, with an order for execution.
  1. (transitive) To draw out or forth; to pull out; to remove forcibly from a fixed position, as by traction or suction, etc.; as, to extract a tooth from its socket, a stump from the earth, a splinter from the finger.
  2. (transitive) To withdraw by expression, distillation, or other mechanical or chemical process; as, to extract an essence. Cf. Abstract, v. t., 6.
  3. (transitive) To take by selection; to choose out; to cite or quote, as a passage from a book.
  4. (context, transitive, arithmetic) To determine (a root of a number).
Please the third root of 27.
extricate Tweet Definition of extricate Like Definition of extricate on Facebook
verb (extricat, ing)
  1. (transitive) To free, disengage, loosen, or untangle.
    I finally managed to myself from the tight jacket.

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