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Glossary · Nouns · A

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TermTypeDefinitionClassificationsUpdated
Avocationnounan auxiliary activityverifiedMay 18, 2026
Avocetnounlong-legged web-footed black-and-white shorebird with slender upward-curving billverifiedMay 18, 2026
AvoidancenounverifiedMay 15, 2026
Avoirdupoisnouna system of weights based on the 16-ounce pound (or 7,000 grains)verifiedMay 18, 2026
Avoirdupois UnitnounMWEany of the units of the avoirdupois system of weightsverifiedMay 18, 2026
Avoirdupois WeightnounMWEa system of weights based on the 16-ounce pound (or 7,000 grains)verifiedMay 18, 2026
Avouchmentnouna statement asserting the existence or the truth of somethingverifiedMay 18, 2026
Avowalnouna statement asserting the existence or the truth of somethingverifiedMay 18, 2026
Avowernounsomeone who admits or acknowledges openly and boldlyverifiedMay 18, 2026
Avulsionnounan abrupt change in the course of a stream that forms the boundary between two parcels of land resulting in the loss of part of the land of one landowner and a consequent increase in the land of anotherverifiedMay 18, 2026
Awakeningnounthe act of wakingverifiedMay 18, 2026
AwardingnounverifiedMay 15, 2026
awarenessnounHaving or showing knowledge or perception about a situation, fact, or development.CapabilityMay 9, 2026
Away GamenounMWEa game played away from homeverifiedMay 18, 2026
Awaynessnounthe state of being elsewhere than in particular placeverifiedMay 18, 2026
Awfulnessnouna quality of extreme unpleasantnessverifiedMay 18, 2026
Awkwardnessnounthe carriage of someone whose movements and posture are ungainly or inelegantverifiedMay 18, 2026
Awlnouna pointed tool for marking surfaces or for punching small holesverifiedMay 18, 2026
Awlwortnounsmall aquatic plant having tufted awl-shaped leaves in a basal rosette and minute white flowersverifiedMay 18, 2026
Awnnounslender bristlelike appendage found on the bracts of grassesverifiedMay 18, 2026
Awningnouna canopy made of canvas to shelter people or things from rain or sunverifiedMay 18, 2026
Awning DecknounMWEa deck at the top of a passenger shipverifiedMay 18, 2026
Awnless BromegrassnounMWEdrought-resistant perennial with awns lacking or very short and long creeping rhizomesverifiedMay 18, 2026
Ax HandlenounMWEthe handle of an axverifiedMay 18, 2026
Ax HeadnounMWEthe cutting head of an axverifiedMay 18, 2026
Axe HandlenounMWEthe handle of an axverifiedMay 18, 2026
Axe HeadnounMWEthe cutting head of an axverifiedMay 18, 2026
Axerophtholnounany of several fat-soluble vitamins essential for normal visionverifiedMay 18, 2026
Axial MotionnounMWErotary motion of an object around its own axisverifiedMay 18, 2026
Axial MusclenounMWEa skeletal muscle of the trunk or headverifiedMay 18, 2026
Axial RotationnounMWErotary motion of an object around its own axisverifiedMay 18, 2026
Axial SkeletonnounMWEthe part of the skeleton that includes the skull and spinal column and sternum and ribsverifiedMay 18, 2026
Axilnounthe upper angle between an axis and an offshoot such as a branch or leafstalkverifiedMay 18, 2026
Axile PlacentationnounMWEovules are borne at or around the center of a compound ovary on an axis formed from joined septaverifiedMay 18, 2026
Axillanounthe hollow under the arm where it is joined to the shoulderverifiedMay 18, 2026
Axillary ArterynounMWEthe part of the main artery of the arm that lies in the armpit and is continuous with the subclavian artery above and the brachial artery belowverifiedMay 18, 2026
Axillary CavitynounMWEthe hollow under the arm where it is joined to the shoulderverifiedMay 18, 2026
Axillary FossanounMWEthe hollow under the arm where it is joined to the shoulderverifiedMay 18, 2026
Axillary NodenounMWEany of the lymph glands of the armpitverifiedMay 18, 2026
Axillary VeinnounMWEa continuation of the basilic vein and brachial vein that becomes the subclavian veinverifiedMay 18, 2026
Axiologynounthe study of values and value judgmentsverifiedMay 18, 2026
Axiomnoun(logic) a proposition that is not susceptible of proof or disproofverifiedMay 18, 2026
Axisnounthe main stem or central part about which plant organs or plant parts such as branches are arrangedverifiedMay 18, 2026
Axis of RotationnounMWEthe center around which something rotatesverifiedMay 18, 2026
Axis VertebranounMWEthe 2nd cervical vertebraverifiedMay 18, 2026
Axlenouna shaft on which a wheel rotatesverifiedMay 18, 2026
Axle BarnounMWEan iron bar that serves as an axletreeverifiedMay 18, 2026
Axle GreasenounMWEa thick heavy grease used to lubricate axlesverifiedMay 18, 2026
Axletreenouna dead axle on a carriage or wagon that has terminal spindles on which the wheels revolveverifiedMay 18, 2026
Axolemmanounouter membrane covering an axonverifiedMay 18, 2026
Axolotlnounlarval salamander of mountain lakes of Mexico that usually lives without metamorphosingverifiedMay 18, 2026
Axonnounlong nerve fiber that conducts away from the cell body of the neuronverifiedMay 18, 2026
Axonenounlong nerve fiber that conducts away from the cell body of the neuronverifiedMay 18, 2026
AxseednounEuropean herb resembling vetchverifiedMay 18, 2026
Ayahnoun(in India) a native nursemaid who looks after childrenverifiedMay 18, 2026
Ayapananounlow spreading tropical American shrub with long slender leaves used to make a mildly stimulating drink resembling teaverifiedMay 18, 2026
Ayatollahnouna high-ranking Shiite religious leader who is regarded as an authority on religious law and its interpretation and who has political power as wellverifiedMay 18, 2026
Aye-Ayenounnocturnal lemur with long bony fingers and rodent-like incisor teeth closely related to the lemursverifiedMay 18, 2026
Ayinnounthe 16th letter of the Hebrew alphabetverifiedMay 18, 2026
AzadirachtinnouninsecticideverifiedMay 18, 2026
Azaleanounany of numerous ornamental shrubs grown for their showy flowers of various colorsverifiedMay 18, 2026
Azathioprinenounan immunosuppressive drug (trade name Imuran) used to prevent rejection of a transplanted organverifiedMay 18, 2026
Azederachnountree of northern India and China having purple blossoms and small inedible yellow fruitsverifiedMay 18, 2026
Azidenouna chemical compound containing the azido group combined with an element or radicalverifiedMay 18, 2026
Azido GroupnounMWEthe univalent group N3- derived from hydrazoic acidverifiedMay 18, 2026
Azido RadicalnounMWEthe univalent group N3- derived from hydrazoic acidverifiedMay 18, 2026
Azimuthnounthe azimuth of a celestial body is the angle between the vertical plane containing it and the plane of the meridianverifiedMay 18, 2026
Azithromycinnouna systemic antibacterial medicine (trade name Zithromax) that is prescribed to treat bacterial infections in many different parts of the bodyverifiedMay 18, 2026
Azo DyenounMWEany dye containing one or more azo groupsverifiedMay 18, 2026
Azo GroupnounMWEthe bivalent group -N=N- united to two hydrocarbon groupsverifiedMay 18, 2026
Azo RadicalnounMWEthe bivalent group -N=N- united to two hydrocarbon groupsverifiedMay 18, 2026
Azoimidenouna colorless explosive liquid that is volatile and poisonous and foul-smellingverifiedMay 18, 2026
Azotaemianounaccumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urineverifiedMay 18, 2026
Azotenounan obsolete name for nitrogenverifiedMay 18, 2026
Azotemianounaccumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urineverifiedMay 18, 2026
Azoturianounexcess of urea in the urineverifiedMay 18, 2026
Aztreonamnounan antibiotic (trade name Azactam) used against severe infectionsverifiedMay 18, 2026
Azure AsternounMWEa variety of asterverifiedMay 18, 2026
Azuritenounblue carbonate of copperverifiedMay 18, 2026
Azygos VeinnounMWEone of a system of veins that drain the thoracic and abdominal wallsverifiedMay 18, 2026
Azygous VeinnounMWEone of a system of veins that drain the thoracic and abdominal wallsverifiedMay 18, 2026
Azymianounabsence of an enzymeverifiedMay 18, 2026