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Glossary of Chemistry Terms
beginning with letter L
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LA Tweet Definition of LA Like Definition of LA on Facebook
  1. Louisiana, a state of the United States of America.
  1. Los Angeles (US city)
  2. lead arsenate, a pesticide introduced in the US in 1892, largely replaced by DDT in the late 1940's, and ultimately banned in 1988.
label Tweet Definition of label Like Definition of label on Facebook
  1. A small ticket or sign giving information about something to which it is attached or intended to be attached.
  2. A name given to something or someone to categorise them as part of a particular social group.
  3. A company that sells records.
verb (labels, 2=labelling i, UK) or labeling (i, US), 3=labelled (i, UK) or labeled (i, US)
  1. (transitive) To put a label (a ticket or sign) on (something).
  2. (transitive) To give a label to (someone or something) in order to categorise that person or thing.
labile Tweet Definition of labile Like Definition of labile on Facebook
  1. Liable to slip, err, fall, or apostatize.
  2. Apt or likely to change.
  3. (context, chemistry, of a compound or bond) Kinetically unstable; rapidly cleaved (and possibly reformed).
Certain drugs can be conjugated to polymer molecules with a linkage that is at low pH to effect controlled release in a cellular endosome.
Water ligands typically bind metals in a fashion and are rapidly interchanged in aqueous solution.
lactam Tweet Definition of lactam Like Definition of lactam on Facebook
  1. (organic chemistry) Any of a class of cyclic amides, that are the nitrogen analogs of lactones, formed by heating amino acids; the tautomeric enol forms are known as lactims.
lactate Tweet Definition of lactate Like Definition of lactate on Facebook
  1. (chemistry) Any salt or ester of lactic acid
verb (lactat, ing)
  1. (intransitive) To secrete or produce milk
lactone Tweet Definition of lactone Like Definition of lactone on Facebook
  1. (organic chemistry) A cyclic intramolecular ester derived from a hydroxy acid.
lampblack Tweet Definition of lampblack Like Definition of lampblack on Facebook
  1. An amorphous form of carbon made from incompletely burned organic matter; used to make pigments and inks.
lanthanide Tweet Definition of lanthanide Like Definition of lanthanide on Facebook
  1. (chemistry) any of the 14 rare earth elements from cerium (or from lanthanum) to lutetium in the periodic table; because their outermost orbitals are empty, they have very similar chemistry; below them are the actinides
lanthanum Tweet Definition of lanthanum Like Definition of lanthanum on Facebook
  1. A metallic chemical element (symbol La) with an atomic number of 57.
latex Tweet Definition of latex Like Definition of latex on Facebook
noun (latices, pl2=latexes)
  1. The milky sap of several trees that coagulates on exposure to air; used to make rubber.
  2. An emulsion of rubber in water, used in adhesives and the like.
  1. Made from latex.
laurate Tweet Definition of laurate Like Definition of laurate on Facebook
  1. (chemistry) any salt or ester of lauric acid
lauric Tweet Definition of lauric Like Definition of lauric on Facebook
  1. Pertaining to, or derived from, the European bay or laurel (Laurus nobilis)
lauric acid Tweet Definition of lauric acid Like Definition of lauric acid on Facebook
  1. (chemistry) a fatty acid, CH3(CH2)10COOH, occurring in coconut, palm and laurel oil; mostly used in making cosmetics and soaps
lawrencium Tweet Definition of lawrencium Like Definition of lawrencium on Facebook
  1. A transuranic chemical element (symbol Lr, formerly Lw) with atomic number 103.
LDPE Tweet Definition of LDPE Like Definition of LDPE on Facebook
  1. Low Density Polyethylene
leach Tweet Definition of leach Like Definition of leach on Facebook
noun (leaches)
  1. A quantity of wood ashes, through which water passes, and thus imbibes the alkali.
  2. A tub or vat for leaching ashes, bark, etc.
verb (leaches, leaching, leached, leached)
  1. (transitive) To purge a soluble matter out of something by the action of a percolate, percolating fluid.
Heavy rainfall can out minerals important for plant growth from the soil.
The mercury in dental amalgams can out from the fillings into the body.
lead Tweet Definition of lead Like Definition of lead on Facebook
  1. (context, uncountable, element) A heavy, pliable, inelastic metal element, having a bright, bluish color, but easily tarnished; both malleable and ductile, though with little tenacity. It is easily fusible, forms alloys with other metals, and is an ingredient of solder and type metal. Atomic number 82, Atomic weight 206.4, Specific Gravity 11.37, Symbol Pb (from Latin plumbum).
  2. (countable) A plummet or mass of lead, used in sounding at sea.
  3. A thin strip of type metal, used to separate lines of type in printing.
  4. Sheets or plates of lead used as a covering for roofs.
  5. (context, in plural leads) A roof covered with lead sheets or terne plates.
  • I would have the tower two stories, and goodly leads upon the top. " Bacon
    1. (countable) A cylinder of black lead or plumbago used in pencils.
  1. (transitive) To cover, fill, or affect with lead; as, continuous firing leads the grooves of a rifle.
  2. (context, transitive, printing) To place leads between the lines of; as, to lead a page; leaded matter.
  1. (not comparable) foremost, Foremost.
The contestants are all tied; no one has the lead position.
lead oxide Tweet Definition of lead oxide Like Definition of lead oxide on Facebook
noun (wikipedia, Lead(II) oxide)
  1. (chemistry) a yellow oxide of lead, PbO?, used in the manufacture of paints and glass
levigate Tweet Definition of levigate Like Definition of levigate on Facebook
  1. An alternative spelling of lí¦vigate.
Lewis acid Tweet Definition of Lewis acid Like Definition of Lewis acid on Facebook
  1. (chemistry) Any electrophylic compound that can accept a pair of electrons and form a coordinate covalent bond
Lewis base Tweet Definition of Lewis base Like Definition of Lewis base on Facebook
  1. (chemistry) Any nucleophylic compound that can donate a pair of electrons and form a coordinate covalent bond.
Li Tweet Definition of Li Like Definition of Li on Facebook
proper noun 
  1. A surname of Chinese origin, a variant of Lee (See: �).
ligand Tweet Definition of ligand Like Definition of ligand on Facebook
  1. (chemistry) An ion, molecule, or functional group that binds to another chemical entity to form a larger complex.
lime Tweet Definition of lime Like Definition of lime on Facebook
  1. (poetic) any gluey or adhesive substance; something which traps or captures someone
  2. (mineralogy) A white alkaline substance, calcium oxide, obtained from limestone; quicklime
  • 1952: Lime, which is the product of the burning of chalk or limestone, might be bought ready burnt, or it could be burnt in kilns specially constructed in the neighbourhood of the building operations. — L.F. Salzman, Building in England, page 149.
    1. A dry white powder (calcium hydroxide).
verb (lim, ing)
  1. (transitive) To treat with calcium hydroxide or calcium oxide (lime).
  1. Containing lime or lime juice.
  2. lime-green, Lime-green.
linalool Tweet Definition of linalool Like Definition of linalool on Facebook
  1. (chemistry) a monoterpene alcohol found in many essential oils
link Tweet Definition of link Like Definition of link on Facebook
  1. A connection between places, persons, events, or things.
The mayor's assistant serves as the to the media.
  1. One element of a chain.
The third of the silver chain needs to be resoldered.
The weakest .
  1. (computing) The connection between busses or systems.
A by-N- is composed of N lanes.
  1. (obsolete) A torch used to light dark streets.
  1. (transitive): To connect two or more things.
linoleic Tweet Definition of linoleic Like Definition of linoleic on Facebook
  1. Of, or derived from linoleum, or linseed oil
  2. (chemistry) designating an organic fatty acid, a thin yellow oil, found combined as an ester of glycerol in oils of linseed, poppy, hemp, and certain nuts; it is a polyunsaturated fatty acid with 18 carbon atoms and two double bonds.
linoleic acid Tweet Definition of linoleic acid Like Definition of linoleic acid on Facebook
  1. an polyunsaturated fatty acid essential for human nutrition; it is found in linseed, sunflower and other vegetable oils
  1. (chemistry) 9,12-octadecadienoic acid CH3(CH2)4CH=CHCH2CH=CH(CH2)7COOH
liquidus Tweet Definition of liquidus Like Definition of liquidus on Facebook
  1. (chemistry),(physics) a line, in a phase diagram, above which a given substance is a stable liquid
liquor Tweet Definition of liquor Like Definition of liquor on Facebook
  1. Strong alcoholic drink derived from fermentation and distillation (American English)
  2. liquid obtained by cooking meat or vegetables (or both)
  1. (intransitive) To drink liquor, usually to excess.
  2. (transitive) To cause someone to drink liquor, usually to excess.
litharge Tweet Definition of litharge Like Definition of litharge on Facebook
  1. lead monoxide, PbO?, a toxic solid formed from the oxidisation of lead in air, and used as a pigment
  • 1997: From an inner pocket he produces a costly Ramillies Wig, shakes it out in a brisk Cloud of scented Litharge, and claps it on, with a minimum of fuss, over his ascetic"s Crop. " Thomas Pynchon, Mason & Dixon
lithia Tweet Definition of lithia Like Definition of lithia on Facebook
  1. lithium oxide, Li2O, used in the manufacture of ceramics and glass
lithic Tweet Definition of lithic Like Definition of lithic on Facebook
  1. Of or pertaining to stone; as, lithic architecture.
  2. (chemistry) of, or relating to lithium
lithium Tweet Definition of lithium Like Definition of lithium on Facebook
  1. (element) The simplest alkali metal, the lightest solid element, and the third lightest chemical element (symbol Li) with an atomic number of 3.
  2. (pharmaceutical drug) lithium carbonate, Lithium carbonate or other preparations of lithium metal used to treat manic depression and bipolar disorders.
lithium aluminum hydride Tweet Definition of lithium aluminum hydride Like Definition of lithium aluminum hydride on Facebook
  1. alternative spelling of lithium aluminium hydride
lithium carbonate Tweet Definition of lithium carbonate Like Definition of lithium carbonate on Facebook
  1. (chemistry) The lithium salt of carbonic acid, Li2CO3, used in the manufacture of glass and ceramics, and medically, in the treatment of bipolar disorder.
lithium chloride Tweet Definition of lithium chloride Like Definition of lithium chloride on Facebook
  1. (chemistry) the lithium salt of hydrochloric acid, LiCl?, used in the electrolytic production of lithium metal, and as a flux
lithium fluoride Tweet Definition of lithium fluoride Like Definition of lithium fluoride on Facebook
noun (molecular formula LiF?)
  1. (chemistry) a salt that may be prepared by the action of hydrofluoric acid on many lithium compounds, and occurs naturally as griceite; its crystals are used in optical instruments, and in radiation dosimetry (based on its radiothermoluminescence)
lithium hydroxide Tweet Definition of lithium hydroxide Like Definition of lithium hydroxide on Facebook
  1. (chemistry) an alkali, LiOH?, used in gas-purification systems in spacecraft, submarines etc, and in the preparation of lithium soap
lithium oxide Tweet Definition of lithium oxide Like Definition of lithium oxide on Facebook
  1. (chemistry) a white, powdered alkali, Li2O, used in the manufacture of glass and ceramics
lithium stearate Tweet Definition of lithium stearate Like Definition of lithium stearate on Facebook
  1. (chemistry) the lithium salt of stearic acid; a lithium soap made from tallow
litmus Tweet Definition of litmus Like Definition of litmus on Facebook
  1. A dyestuff extracted from certain lichens.
litmus test Tweet Definition of litmus test Like Definition of litmus test on Facebook
  1. (chemistry) a simple test for the acidity or alkalinity of a substance, using litmus paper
    1. any over-simplistic test that uses a single indicator
    The President's policy on abortion is regarded as a of his views on women's rights.
liver Tweet Definition of liver Like Definition of liver on Facebook
  1. (anatomy) A large organ in the body that stores and metabolizes nutrients, destroys toxins and produces bile. Responsible for thousands of biochemical reactions.
  2. This livestock organ used as food.
  3. (color) A dark brown colour, tinted with red and gray, like that of liver.
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adjective (the noun as a modifier)<br>
(no (compar) or (superl) forms)
  1. Concerning or relating to the liver.
liver transplant
  1. Intended for the liver.
liver salts
  1. Of food, made of liver.
liver pí¢té
lixiviate Tweet Definition of lixiviate Like Definition of lixiviate on Facebook
  1. to separate a substance into soluble and insoluble components through percolation
  • 1997: the Slaves are out in the Storm, doing their Owners" Laundry, observing and reading each occurrence of Blood, Semen, Excrement, Saliva, Urine, Sweat, Road-Mud, dead Skin, and other such Data of Biography, whose pure form they practice Daily, before all is lixiviated "neath Heaven. " Thomas Pynchon, Mason & Dixon
LNG Tweet Definition of LNG Like Definition of LNG on Facebook
  1. Liquefied Natural Gas
loose Tweet Definition of loose Like Definition of loose on Facebook
verb (looses, loosing, loosed)
  1. (transitive) To let loose, to free from restraints.
  2. (transitive) To unfasten, to loosen.
  3. (transitive) To make less tight, to loosen.
  4. (intransitive) Of a grip or hold, to let go.
adjective (loos, er)
  1. Not fixed in place tightly or firmly
This wheelbarrow has a wheel
  1. Not held or packaged together
You can buy apples in a pack, but they are cheaper
  1. Not bound or tethered or leashed
The dog is again
  1. Not fitting closely
I wear clothes when it is hot
  1. Not compact
It is difficult walking on gravel
  1. relaxed
She danced with a flowing movement
  1. indiscreet
Loose talk costs lives
  1. (dated) promiscuous
She is a woman
  1. (poker) A player who plays many hands
  2. (poker) A strategy which involves playing many hands
luminous paint Tweet Definition of luminous paint Like Definition of luminous paint on Facebook
  1. paint that glows in the dark; either energized by a radioactive salt, or by preexcitation by light
lunar Tweet Definition of lunar Like Definition of lunar on Facebook
  1. Pertaining to the moon.
  2. Crescent shaped, lunate.
  3. Of, or relating to silver.
lutecium Tweet Definition of lutecium Like Definition of lutecium on Facebook
  1. (context, archaic, element) lutetium
lutetium Tweet Definition of lutetium Like Definition of lutetium on Facebook
  1. (element) A metallic chemical element (symbol Lu) with an atomic number of 71.
lye Tweet Definition of lye Like Definition of lye on Facebook
  1. A strong caustic alkaline solution of potassium or sodium salts, obtained by leaching wood ashes. It is much used in making soap as well as its use in biodiesel.
verb (infl, en, verb)
  1. (obsolete spelling of, lie)
lyophilic Tweet Definition of lyophilic Like Definition of lyophilic on Facebook
  1. (context, of a colloid) Having an affinity for the dispersion medium and thus not easily precipitated.
lyotropic Tweet Definition of lyotropic Like Definition of lyotropic on Facebook
  1. (chemistry),(physics) describing a liquid crystal that exhibits phase transitions as a function of concentration
lysergic acid Tweet Definition of lysergic acid Like Definition of lysergic acid on Facebook
  1. (organic compound) An organic compound, 6-methyl-9,10-didehydro-ergoline-8-carboxylic acid, derived from an alkaloid found in ergot; its amide derivatives are widely used as pharmaceuticals and as hallucinogenic drugs (LSD).

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