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Glossary · Nouns · A

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TermTypeDefinitionClassificationsUpdated
Arccosnounthe inverse function of the cosineverifiedMay 18, 2026
Arcdegreenouna measure for arcs and anglesverifiedMay 18, 2026
Arcellanounan amoeba-like protozoan with a chitinous shell resembling an umbrellaverifiedMay 18, 2026
Arch SupportnounMWEa support for the arch of the footverifiedMay 18, 2026
Archaebacteriumnounconsidered ancient life forms that evolved separately from bacteria and blue-green algaeverifiedMay 18, 2026
Archaeobacterianounconsidered ancient life forms that evolved separately from bacteria and blue-green algaeverifiedMay 18, 2026
Archaeologistnounan anthropologist who studies prehistoric people and their cultureverifiedMay 18, 2026
Archaeologynounthe branch of anthropology that studies prehistoric people and their culturesverifiedMay 18, 2026
Archaeopteryxnounextinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bonesverifiedMay 18, 2026
Archaeornisnounextinct primitive toothed bird with a long feathered tail and three free clawed digits on each wingverifiedMay 18, 2026
Archaicismnounthe use of an archaic expressionverifiedMay 18, 2026
Archaismnounthe use of an archaic expressionverifiedMay 18, 2026
Archaistnounan expert or collector of antiquitiesverifiedMay 18, 2026
Archangelnounan angel ranked above the highest rank in the celestial hierarchyverifiedMay 18, 2026
Archbishopnouna bishop of highest rankverifiedMay 18, 2026
Archbishopricnounthe territorial jurisdiction of an archbishopverifiedMay 18, 2026
Archdeaconnoun(Anglican Church) an ecclesiastical dignitary usually ranking just below a bishopverifiedMay 18, 2026
Archdeaconrynounthe territorial jurisdiction of an archdeaconverifiedMay 18, 2026
Archdiocesenounthe diocese of an archbishopverifiedMay 18, 2026
Archduchessnouna wife or widow of an archduke or a princess of the former ruling house of AustriaverifiedMay 18, 2026
Archduchynounthe domain controlled by an archduke or archduchessverifiedMay 18, 2026
Archdukenouna sovereign prince of the former ruling house of AustriaverifiedMay 18, 2026
Archegoniumnouna female sex organ occurring in mosses, ferns, and most gymnospermsverifiedMay 18, 2026
Archenteronnouncentral cavity of the gastrulaverifiedMay 18, 2026
Archeobacterianounconsidered ancient life forms that evolved separately from bacteria and blue-green algaeverifiedMay 18, 2026
Archeological RemainsnounMWEa relic that has been excavated from the soilverifiedMay 18, 2026
Archeological SitenounMWEthe site of an archeological explorationverifiedMay 18, 2026
Archeologistnounan anthropologist who studies prehistoric people and their cultureverifiedMay 18, 2026
Archeologynounthe branch of anthropology that studies prehistoric people and their culturesverifiedMay 18, 2026
Archeopteryxnounextinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bonesverifiedMay 18, 2026
Archernouna person who is expert in the use of a bow and arrowverifiedMay 18, 2026
Archerfishnounany of several small freshwater fishes that catch insects by squirting water at them and knocking them into the waterverifiedMay 18, 2026
Archerynounthe sport of shooting arrows with a bowverifiedMay 18, 2026
Archesporenounprimitive cell or group of cells from which a mother cell developsverifiedMay 18, 2026
Archesporiumnounprimitive cell or group of cells from which a mother cell developsverifiedMay 18, 2026
Archetypenounsomething that serves as a model or a basis for making copiesverifiedMay 18, 2026
Archiannelidnounsmall primitive marine worm lacking external segmentation and resembling polychaete larvaeverifiedMay 18, 2026
Archidiaconatenounoffice or position of an archdeaconverifiedMay 18, 2026
Archilnounany of various lecanoras that yield the dye archilverifiedMay 18, 2026
Archimandritenounthe superior of an abbey of monksverifiedMay 18, 2026
Archinenouna Russian unit of length (71 cm)verifiedMay 18, 2026
Archipalliumnounthe olfactory cortex of the cerebrumverifiedMay 18, 2026
Archipelagonouna group of many islands in a large body of waterverifiedMay 18, 2026
Architectnounsomeone who creates plans to be used in making something (such as buildings)verifiedMay 18, 2026
Architectonicsnounthe science of architectureverifiedMay 18, 2026
Architectural EngineeringnounMWEthe branch of engineering that deals with the construction of buildings (as distinguished from architecture as a design art)verifiedMay 18, 2026
Architectural OrnamentnounMWE(architecture) something added to a building to improve its appearanceverifiedMay 18, 2026
Architectural PlannounMWEscale drawing of a structureverifiedMay 18, 2026
Architectural StylenounMWEarchitecture as a kind of art formverifiedMay 18, 2026
ArchitecturenounDescription of the fundamental underlying design of the components of the business system, or of one element of the business system (e.g., technology), the relationships among them, and the manner in which they support enterprise objectivesFrameworkMay 12, 2026
Architeuthisnounlargest mollusk known about but never seen (to 60 feet long)verifiedMay 18, 2026
Architravenounthe molding around a door or windowverifiedMay 18, 2026
Archivistnouna person in charge of collecting and cataloguing archivesverifiedMay 18, 2026
Archnessnouninappropriate playfulnessverifiedMay 18, 2026
Archosaurnounextinct reptiles including: dinosaursverifiedMay 18, 2026
Archosaurian ReptilenounMWEextinct reptiles including: dinosaursverifiedMay 18, 2026
Archpriestnouna senior clergyman and dignitaryverifiedMay 18, 2026
Archwaynouna passageway under a curved masonry constructionverifiedMay 18, 2026
Arcminutenouna unit of angular distance equal to a 60th of a degreeverifiedMay 18, 2026
Arcsecnounthe inverse function of the secantverifiedMay 18, 2026
Arcsecondnouna 60th part of a minute of arcverifiedMay 18, 2026
Arcsinnounthe inverse function of the sineverifiedMay 18, 2026
Arctannounthe inverse function of the tangentverifiedMay 18, 2026
Arctic MossnounMWEan erect greyish branching lichen of Arctic and even some north temperate regions constituting the chief food for reindeer and caribou and sometimes being eaten by humansverifiedMay 18, 2026
Arctic PoppynounMWEsubarctic perennial poppy of both hemispheres having fragrant white or yellow to orange or peach flowersverifiedMay 18, 2026
Arctic SkuanounMWEa variety of jaegerverifiedMay 18, 2026
Arctic WillownounMWElow creeping shrub of Arctic Europe and AmericaverifiedMay 18, 2026
Arctiidnounstout-bodied broad-winged moth with conspicuously striped or spotted wingsverifiedMay 18, 2026
Arctiid MothnounMWEstout-bodied broad-winged moth with conspicuously striped or spotted wingsverifiedMay 18, 2026
Arcuate ArterynounMWEcurved artery in the footverifiedMay 18, 2026
Arcuate Artery of the KidneynounMWEcurved arteries of the kidneyverifiedMay 18, 2026
Arcuate Vein of the KidneynounMWEveins that receive blood from interlobular veins of kidney and rectal venulesverifiedMay 18, 2026
Arcusnouna whitish deposit in the shape of an arc that is sometimes seen in the corneaverifiedMay 18, 2026
Arcus SenilisnounMWEa whitish deposit in the shape of an arc that is sometimes seen in the corneaverifiedMay 18, 2026
Arcus ZygomaticusnounMWEthe slender arch formed by the temporal process of the cheekbone that bridges to the zygomatic process of the temporal boneverifiedMay 18, 2026
Ardebnouna unit of dry measure used in EgyptverifiedMay 18, 2026
Ardent SpiritsnounMWEstrong distilled liquor or brandyverifiedMay 18, 2026
Ardornouna feeling of strong eagerness (usually in favor of a person or cause)verifiedMay 18, 2026
Ardournouna feeling of strong eagerness (usually in favor of a person or cause)verifiedMay 18, 2026
Arduousnessnounextreme effortfulnessverifiedMay 18, 2026
Arenouna unit of surface area equal to 100 square metersverifiedMay 18, 2026
areanounA region or part of a town, a country, or the world.candidateMay 9, 2026
Area 17 of BrodmannnounMWEthe part of the occipital cortex that receives the fibers of the optic radiation from the lateral geniculate body and is the primary receptive area for visionverifiedMay 18, 2026
Area BombingnounMWEan extensive and systematic bombing intended to devastate a large targetverifiedMay 18, 2026
Area CodenounMWEa number usually of 3 digits assigned to a telephone area as in the United States and CanadaverifiedMay 18, 2026
Area of Cardiac DullnessnounMWEa triangular area of the front of the chest (determined by percussion)verifiedMay 18, 2026
Area UnitnounMWEa system of units used to measure areasverifiedMay 18, 2026
Areawaynouna passageway between buildings or giving access to a basementverifiedMay 18, 2026
Arecanounany of several tall tropical palms native to southeastern Asia having egg-shaped nutsverifiedMay 18, 2026
Areca NutnounMWEseed of betel palmverifiedMay 18, 2026
Areflexianounabsence of a reflexverifiedMay 18, 2026
Arenanounthe central area of an ancient Roman amphitheater where contests and spectacles were heldverifiedMay 18, 2026
Arena TheaternounMWEa theater arranged with seats around at least three sides of the stageverifiedMay 18, 2026
Arenaceous RocknounMWEa sedimentary rock composed of sandverifiedMay 18, 2026
Arenavirusnounanimal viruses belonging to the family ArenaviridaeverifiedMay 18, 2026
Areolanounsmall circular area such as that around the human nipple or an inflamed area around a pimple or insect biteverifiedMay 18, 2026
Areolar TissuenounMWEfibrous connective tissue with the fibers arranged in a mesh or netverifiedMay 18, 2026
Arerenounlarge west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged seedsverifiedMay 18, 2026
Aretenouna sharp narrow ridge found in rugged mountainsverifiedMay 18, 2026
Areteria CervicalisnounMWEan artery that supplies the muscles of the neckverifiedMay 18, 2026