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Glossary · Nouns · A

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TermTypeDefinitionClassificationsUpdated
Allocutionnoun(rhetoric) a formal or authoritative address that advises or exhortsverifiedMay 18, 2026
Allogamynouncross-fertilization in plantsverifiedMay 18, 2026
Allograftnountissue or organ transplanted from a donor of the same species but different genetic makeupverifiedMay 18, 2026
Allographnouna variant form of a grapheme, as `m' or `M' or a handwritten version of that graphemeverifiedMay 18, 2026
Allomerismnoun(chemistry) variability in chemical composition without variation in crystalline formverifiedMay 18, 2026
Allometrynounthe study of the relative growth of a part of an organism in relation to the growth of the wholeverifiedMay 18, 2026
Allomorphnounany of several different crystalline forms of the same chemical compoundverifiedMay 18, 2026
Allopathynounthe usual method of treating disease with remedies that produce effects differing from those produced by the disease itselfverifiedMay 18, 2026
Allopatrynounthe occurrence of related organisms in separate geographical areas with no overlapverifiedMay 18, 2026
Allophonenoun(linguistics) any of various acoustically different forms of the same phonemeverifiedMay 18, 2026
Allopurinolnouna drug (trade name Zyloprim) used to treat gout and other conditions in which there is an excessive buildup of uric acidverifiedMay 18, 2026
Allosaurnounlate Jurassic carnivorous dinosaurverifiedMay 18, 2026
Allosaurusnounlate Jurassic carnivorous dinosaurverifiedMay 18, 2026
Allotmentnounthe act of distributing by allotting or apportioningverifiedMay 18, 2026
Allotropenouna structurally different form of an elementverifiedMay 18, 2026
Allotropismnounthe phenomenon of an element existing in two or more physical formsverifiedMay 18, 2026
Allotropynounthe phenomenon of an element existing in two or more physical formsverifiedMay 18, 2026
allownounLet someone have or do something.candidateMay 9, 2026
Allowance AccountnounMWEa reserve fund created by a charge against profits in order to provide for changes in the value of a company's assetsverifiedMay 18, 2026
Alloy Cast IronnounMWEcast iron containing alloying elements (usually nickel or chromium or copper or molybdenum) to increase the strength or facilitate heat treatmentverifiedMay 18, 2026
Alloy IronnounMWEcast iron containing alloying elements (usually nickel or chromium or copper or molybdenum) to increase the strength or facilitate heat treatmentverifiedMay 18, 2026
Alloy SteelnounMWEsteel who characteristics are determined by the addition of other elements in addition to carbonverifiedMay 18, 2026
Allspicenounground dried berrylike fruit of a West Indian allspice treeverifiedMay 18, 2026
Allspice TreenounMWEtropical American tree having small white flowers and aromatic berriesverifiedMay 18, 2026
AllurementnounverifiedMay 15, 2026
Allusionnounpassing reference or indirect mentionverifiedMay 18, 2026
Allusivenessnouna quality characterized by indirect referenceverifiedMay 18, 2026
Alluvial ConenounMWEa fan-shaped deposit where a fast flowing stream flattens outverifiedMay 18, 2026
Alluvial DepositnounMWEclay or silt or gravel carried by rushing streams and deposited where the stream slows downverifiedMay 18, 2026
Alluvial FannounMWEa fan-shaped deposit where a fast flowing stream flattens outverifiedMay 18, 2026
Alluvial FlatnounMWEa flat resulting from repeated deposits of alluvial material by running waterverifiedMay 18, 2026
Alluvial PlainnounMWEa flat resulting from repeated deposits of alluvial material by running waterverifiedMay 18, 2026
Alluvial SedimentnounMWEclay or silt or gravel carried by rushing streams and deposited where the stream slows downverifiedMay 18, 2026
Alluvial SoilnounMWEa fine-grained fertile soil deposited by water flowing over flood plains or in river bedsverifiedMay 18, 2026
Alluviationnounthe phenomenon of sediment or gravel accumulatingverifiedMay 18, 2026
Alluvionnounclay or silt or gravel carried by rushing streams and deposited where the stream slows downverifiedMay 18, 2026
Alluviumnounclay or silt or gravel carried by rushing streams and deposited where the stream slows downverifiedMay 18, 2026
Allylnounthe univalent unsaturated organic radical C3H5verifiedMay 18, 2026
Allyl AlcoholnounMWEan unsaturated primary alcohol present in wood spiritverifiedMay 18, 2026
Allyl GroupnounMWEthe univalent unsaturated organic radical C3H5verifiedMay 18, 2026
Allyl RadicalnounMWEthe univalent unsaturated organic radical C3H5verifiedMay 18, 2026
Allyl ResinnounMWEa resin derived from allyl alcohol that hardens when curedverifiedMay 18, 2026
Alma MaternounMWEyour alma mater is a school you graduated fromverifiedMay 18, 2026
Almanacnounan annual publication including weather forecasts and other miscellaneous information arranged according to the calendar of a given yearverifiedMay 18, 2026
Almandinenouna deep red garnet consisting of iron aluminum silicateverifiedMay 18, 2026
Almanditenouna deep red garnet consisting of iron aluminum silicateverifiedMay 18, 2026
Almondnounsmall bushy deciduous tree native to Asia and North Africa having pretty pink blossoms and highly prized edible nuts enclosed in a hard green hullverifiedMay 18, 2026
Almond CookienounMWEvery rich cookie containing ground almondsverifiedMay 18, 2026
Almond CrescentnounMWEvery rich cookie containing ground almondsverifiedMay 18, 2026
Almond ExtractnounMWEflavoring made from almonds macerated in alcoholverifiedMay 18, 2026
Almond MothnounMWEa moth whose larvae feed on and mat together with webbing various stored products of vegetable originverifiedMay 18, 2026
Almond OilnounMWEpale yellow fatty oil expressed from sweet or bitter almondsverifiedMay 18, 2026
Almond TreenounMWEany of several small bushy trees having pink or white blossoms and usually bearing nutsverifiedMay 18, 2026
Almond WillownounMWEOld World willow with light green leaves cultivated for use in basketryverifiedMay 18, 2026
Almond-Leaves WillownounMWEwillow of the western United States with leaves like those of peach or almond treesverifiedMay 18, 2026
Almonernounan official in a British hospital who looks after the social and material needs of the patientsverifiedMay 18, 2026
Almsnounmoney or goods contributed to the poorverifiedMay 18, 2026
Alms BoxnounMWEbox for collecting alms, especially one in a churchverifiedMay 18, 2026
Alms DishnounMWEa tray for collecting the offering from a congregationverifiedMay 18, 2026
Alms TraynounMWEa tray for collecting the offering from a congregationverifiedMay 18, 2026
Alms-Givingnounmaking voluntary contributions to aid the poorverifiedMay 18, 2026
Almsgivernouna person who gives almsverifiedMay 18, 2026
Alocasianounany plant of the genus Alocasia having large showy basal leaves and boat-shaped spathe and reddish berriesverifiedMay 18, 2026
Aloe FamilynounMWEone of many families or subfamilies into which some classification systems subdivide the Liliaceae but not widely acceptedverifiedMay 18, 2026
Aloesnouna purgative made from the leaves of aloeverifiedMay 18, 2026
Alohanounan acknowledgment that can be used to say hello or goodbye (aloha is Hawaiian and ciao is Italian)verifiedMay 18, 2026
Alonenessnouna disposition toward being aloneverifiedMay 18, 2026
Aloofnessnouna disposition to be distant and unsympathetic in mannerverifiedMay 18, 2026
Alopecianounloss of hair (especially on the head) or loss of wool or feathersverifiedMay 18, 2026
Alopecia AreatanounMWEpatchy baldnessverifiedMay 18, 2026
Alpnounany high mountainverifiedMay 18, 2026
Alpacanouna thin glossy fabric made of the wool of the Lama pacos, or made of a rayon or cotton imitation of that woolverifiedMay 18, 2026
Alpenstocknouna stout staff with a metal pointverifiedMay 18, 2026
Alpha and OmeganounMWEthe basic meaning of somethingverifiedMay 18, 2026
Alpha BlockernounMWEany of various drugs that block alpha-adrenergic receptorsverifiedMay 18, 2026
Alpha BrassnounMWEan alloy of brass and zincverifiedMay 18, 2026
Alpha BronzenounMWEan alloy of copper and tin that can be workedverifiedMay 18, 2026
Alpha DecaynounMWEradioactive decay of an atomic nucleus that is accompanied by the emission of an alpha particleverifiedMay 18, 2026
Alpha GlobulinnounMWEa globulin in blood plasma or serum that is alkaline and has great electrophoretic mobilityverifiedMay 18, 2026
Alpha IronnounMWEa magnetic allotrope of ironverifiedMay 18, 2026
Alpha Methyl DopanounMWEantihypertensive drug (trade name Aldomet) used in the treatment of high blood pressureverifiedMay 18, 2026
Alpha ParticlenounMWEa positively charged particle that is the nucleus of the helium atomverifiedMay 18, 2026
Alpha PrivativenounMWEthe negative prefix a- or un-verifiedMay 18, 2026
Alpha RadiationnounMWEthe radiation of alpha particles during radioactive decayverifiedMay 18, 2026
Alpha RaynounMWEthe radiation of alpha particles during radioactive decayverifiedMay 18, 2026
Alpha ReceptornounMWEreceptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasoconstriction and relaxation of intestinal muscles and contraction of smooth muscles)verifiedMay 18, 2026
Alpha RhythmnounMWEthe normal brainwave in the electroencephalogram of a person who is awake but relaxedverifiedMay 18, 2026
Alpha SoftwarenounMWEa first release of a software product that is usually tested only by the developersverifiedMay 18, 2026
Alpha TestnounMWEa first test of an experimental product such as computer software verifiedMay 18, 2026
Alpha WavenounMWEthe normal brainwave in the electroencephalogram of a person who is awake but relaxedverifiedMay 18, 2026
Alpha-Adrenergic BlockernounMWEany of various drugs that block alpha-adrenergic receptorsverifiedMay 18, 2026
Alpha-Adrenergic Blocking AgentnounMWEany of various drugs that block alpha-adrenergic receptorsverifiedMay 18, 2026
Alpha-Adrenergic ReceptornounMWEreceptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasoconstriction and relaxation of intestinal muscles and contraction of smooth muscles)verifiedMay 18, 2026
Alpha-Adrenoceptornounreceptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasoconstriction and relaxation of intestinal muscles and contraction of smooth muscles)verifiedMay 18, 2026
Alpha-Beta BrassnounMWEa brass that has more zinc and is stronger than alpha brassverifiedMay 18, 2026
Alpha-Interferonnouna form of interferon that is produced endogenously and commercially for its pharmacological effects (including regulation of the immune system and antiviral and antineoplastic effects)verifiedMay 18, 2026
Alpha-Linolenic AcidnounMWEa polyunsaturated fatty acid with 18 carbon atomsverifiedMay 18, 2026
Alpha-Lipoproteinnouna lipoprotein that transports cholesterol in the bloodverifiedMay 18, 2026
Alpha-Naphtholnounan isomer of naphthol used in dyesverifiedMay 18, 2026
Alpha-Naphthol TestnounMWEbiochemical indicator of the presence of carbohydrates in a solutionverifiedMay 18, 2026