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Glossary · Nouns · A

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TermTypeDefinitionClassificationsUpdated
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
Arethusanounany of several bog orchids of the genus Arethusa having 1 or 2 showy flowersverifiedMay 18, 2026
Argalnounwild sheep of semidesert regions in central AsiaverifiedMay 18, 2026
Argalinounwild sheep of semidesert regions in central AsiaverifiedMay 18, 2026
Argasidnountick lacking a dorsal shield and having mouth parts on the under side of the headverifiedMay 18, 2026
Argemonenounany plant of the genus Argemone having large white or yellow flowers and prickly leaves and stems and podsverifiedMay 18, 2026
Argentinosaurnounhuge herbivorous dinosaur of Cretaceous found in ArgentinaverifiedMay 18, 2026
Argentitenouna valuable silver ore consisting of silver sulfide (Ag2S)verifiedMay 18, 2026
Argilnouna white clay (especially a white clay used by potters)verifiedMay 18, 2026
Argillaceous RocknounMWEa sedimentary rock formed from clay depositsverifiedMay 18, 2026
Argillitenouna sedimentary rock differing from shale in being bound by silica and from slate in having no slate cleavagesverifiedMay 18, 2026
Argininenouna bitter tasting amino acid found in proteins and necessary for nutritionverifiedMay 18, 2026
Argle-Barglenouna verbal disputeverifiedMay 18, 2026
Argonnouna colorless and odorless inert gasverifiedMay 18, 2026
Argonautnounsomeone engaged in a dangerous but potentially rewarding adventureverifiedMay 18, 2026
Argononnounany of the chemically inert gaseous elements of the helium group in the periodic tableverifiedMay 18, 2026
Argosynounone or more large merchant shipsverifiedMay 18, 2026
Argotnouna characteristic language of a particular group (as among thieves)verifiedMay 18, 2026
Arguernounsomeone who engages in debateverifiedMay 18, 2026
Arguingnouna contentious speech actverifiedMay 18, 2026
Argumentnoun(computer science) a reference or value that is passed to a function, procedure, subroutine, command, or programverifiedMay 18, 2026
Argumentationnouna discussion in which reasons are advanced for and against some proposition or proposalverifiedMay 18, 2026
Argusnounlarge brilliantly patterned East Indian pheasantverifiedMay 18, 2026
Argus PheasantnounMWElarge brilliantly patterned East Indian pheasantverifiedMay 18, 2026
Argy-Bargynouna verbal disputeverifiedMay 18, 2026
Argylenouna covered gravy holder of silver or other metal containing a detachable central vessel for hot water to keep the gravy warmverifiedMay 18, 2026
Argyllnouna covered gravy holder of silver or other metal containing a detachable central vessel for hot water to keep the gravy warmverifiedMay 18, 2026
Argyroditenouna rare steel-grey mineral consisting of silver and germanium and sulfurverifiedMay 18, 2026
Arianounan elaborate song for solo voiceverifiedMay 18, 2026
Arial MosaicnounMWEarrangement of aerial photographs forming a composite pictureverifiedMay 18, 2026
Arianistnounan adherent of Arianism (the belief that Jesus Christ was not truly God)verifiedMay 18, 2026
Ariditynouna deficiency of moisture (especially when resulting from a permanent absence of rainfall)verifiedMay 18, 2026
Aridnessnouna deficiency of moisture (especially when resulting from a permanent absence of rainfall)verifiedMay 18, 2026
Ariettanouna short ariaverifiedMay 18, 2026
Arilnounfleshy and usually brightly colored cover of some seeds that develops from the ovule stalk and partially or entirely envelopes the seedverifiedMay 18, 2026
Ariosonoun(music) a short recitative that is melodic but is not an ariaverifiedMay 18, 2026
Arishthnounlarge semi-evergreen tree of the East IndiesverifiedMay 18, 2026
Aristanounbristlelike process near the tip of the antenna of certain fliesverifiedMay 18, 2026
Aristocracynouna privileged class holding hereditary titlesverifiedMay 18, 2026
Aristocratnouna member of the aristocracyverifiedMay 18, 2026
Arithmancynoundivination by means of numbersverifiedMay 18, 2026
Arithmetic MeannounMWEthe sum of the values of a random variable divided by the number of valuesverifiedMay 18, 2026
Arithmetic OperationnounMWEa mathematical operation involving numbersverifiedMay 18, 2026
Arithmetic ProgressionnounMWE(mathematics) a progression in which a constant is added to each term in order to obtain the next termverifiedMay 18, 2026
Arithmeticiannounsomeone who specializes in arithmeticverifiedMay 18, 2026
Aritynounthe number of arguments that a function can takeverifiedMay 18, 2026
Arknouna boat built by Noah to save his family and animals from the floodverifiedMay 18, 2026
Ark ShellnounMWEmarine bivalve mollusk having a heavy toothed shell with a deep boat-like inner surfaceverifiedMay 18, 2026
Arlesnounmoney given by a buyer to a seller to bind a contractverifiedMay 18, 2026
Arm BonenounMWEa bone in the armverifiedMay 18, 2026
Arm ExercisenounMWEexercise designed to strengthen the arm musclesverifiedMay 18, 2026
Arm GuardnounMWEa pad worn by football players and hockey goalkeepersverifiedMay 18, 2026
Arm PadnounMWEa pad worn by football players and hockey goalkeepersverifiedMay 18, 2026
Arm-Twistingnounpersuasion by the use of direct personal pressureverifiedMay 18, 2026
Arm's LengthnounMWEa distance sufficient to exclude intimacyverifiedMay 18, 2026
Armadanouna large fleetverifiedMay 18, 2026
Armadillonounburrowing chiefly nocturnal mammal with body covered with strong horny platesverifiedMay 18, 2026
Armageddonnouna disastrous eventverifiedMay 18, 2026
Armamentnounthe act of equiping with weapons in preparation for warverifiedMay 18, 2026
Armamentariumnounthe collection of equipment and methods used in the practice of medicineverifiedMay 18, 2026
Armaturenouncoil in which voltage is induced by motion through a magnetic fieldverifiedMay 18, 2026
Armbandnounworn around arm as identification or to indicate mourningverifiedMay 18, 2026
Armchairnounchair with a support on each side for armsverifiedMay 18, 2026
Armchair LiberalnounMWEa person of liberal ideals who takes no action to realize themverifiedMay 18, 2026
Armed BullheadnounMWEnorthern Atlantic sea poacherverifiedMay 18, 2026
Armed CombatnounMWEan engagement fought between two military forcesverifiedMay 18, 2026
Armed ForcesnounMWEthe military forces of a nationverifiedMay 18, 2026
Armed Forces CensorshipnounMWEmilitary censorship of personal communications to or from persons in the armed forcesverifiedMay 18, 2026
Armed RobberynounMWErobbery at gunpointverifiedMay 18, 2026
Armed ServicenounMWEa force that is a branch of the armed forcesverifiedMay 18, 2026
Armetnouna medieval helmet with a visor and a neck guardverifiedMay 18, 2026
Armfulnounthe quantity that can be contained in the armsverifiedMay 18, 2026
Armholenouna hole through which you put your arm and where a sleeve can be attachedverifiedMay 18, 2026
Armigernouna nobleman entitled to bear heraldic armsverifiedMay 18, 2026
Armillanoun(archeology) a bracelet worn around the wrist or armverifiedMay 18, 2026
Armillary SpherenounMWEa celestial globe consisting of metal hoopsverifiedMay 18, 2026
Armingnounthe act of equiping with weapons in preparation for warverifiedMay 18, 2026
Armisticenouna state of peace agreed to between opponents so they can discuss peace termsverifiedMay 18, 2026
Armletnouna band worn around the arm for decorationverifiedMay 18, 2026
Armoirenouna large wardrobe or cabinetverifiedMay 18, 2026
Armor PlatenounMWEspecially hardened steel plate used to protect fortifications or vehicles from enemy fireverifiedMay 18, 2026
Armor PlatingnounMWEspecially hardened steel plate used to protect fortifications or vehicles from enemy fireverifiedMay 18, 2026
Armor-Bearernouna squire carrying the armor of a knightverifiedMay 18, 2026
Armored CarnounMWEan armor-plated truck with strong doors and locks used to transport money or valuablesverifiedMay 18, 2026
Armored CatfishnounMWESouth American catfish having the body covered with bony platesverifiedMay 18, 2026