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Glossary · Nouns · A

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TermTypeDefinitionClassificationsUpdated
Antioxidantnounsubstance that inhibits oxidation or inhibits reactions promoted by oxygen or peroxidesverifiedMay 18, 2026
Antiparticlenouna particle that has the same mass as another particle but has opposite values for its other propertiesverifiedMay 18, 2026
Antipastonouna course of appetizers in an Italian mealverifiedMay 18, 2026
Antipathynounthe object of a feeling of intense aversionverifiedMay 18, 2026
Antipernicious Anemia FactornounMWEa B vitamin that is used to treat pernicious anemiaverifiedMay 18, 2026
Antipersonnel BombnounMWEa bomb with only 10 to 20 per cent explosive and the remainder consisting of casings designed to break into many small high-velocity fragmentsverifiedMay 18, 2026
Antiperspirantnounan astringent substance applied to the skin to reduce perspirationverifiedMay 18, 2026
Antiphonnouna verse or song to be chanted or sung in responseverifiedMay 18, 2026
Antiphonynounalternate (responsive) singing by a choir in two partsverifiedMay 18, 2026
Antiphrasisnounthe use of a word in a sense opposite to its normal sense (especially in irony)verifiedMay 18, 2026
Antipodal OppositionnounMWEthe relation of opposition along a diameterverifiedMay 18, 2026
Antipodesnounany two places or regions on diametrically opposite sides of the EarthverifiedMay 18, 2026
Antipopenounsomeone who is elected pope in opposition to another person who is held to be canonically electedverifiedMay 18, 2026
Antiprotonnounan unstable negatively charged protonverifiedMay 18, 2026
Antiprotozoalnouna medicinal drug used to fight diseases (like malaria) that are caused by protozoaverifiedMay 18, 2026
Antiprotozoal DrugnounMWEa medicinal drug used to fight diseases (like malaria) that are caused by protozoaverifiedMay 18, 2026
Antipruriticnouna substance that relieves or prevents itchingverifiedMay 18, 2026
Antipsychoticnountranquilizer used to treat psychotic conditions when a calming effect is desiredverifiedMay 18, 2026
Antipsychotic AgentnounMWEtranquilizer used to treat psychotic conditions when a calming effect is desiredverifiedMay 18, 2026
Antipsychotic DrugnounMWEtranquilizer used to treat psychotic conditions when a calming effect is desiredverifiedMay 18, 2026
Antipyresisnounmedication with antipyretics to treat a feververifiedMay 18, 2026
Antiquarknounthe antiparticle of a quarkverifiedMay 18, 2026
Antiquarynounan expert or collector of antiquitiesverifiedMay 18, 2026
Antiquitynounthe historic period preceding the Middle Ages in EuropeverifiedMay 18, 2026
Antiredepositionnounthe process of preventing redepositionverifiedMay 18, 2026
Antisepsisnounthe process of inhibiting the growth and multiplication of microorganismsverifiedMay 18, 2026
Antiserumnounblood serum containing antibodies against specific antigensverifiedMay 18, 2026
Antisocial Personality DisordernounMWEa personality disorder characterized by amorality and lack of affectverifiedMay 18, 2026
Antispasmodicnouna drug used to relieve or prevent spasms (especially of the smooth muscles)verifiedMay 18, 2026
Antispasmodic AgentnounMWEa drug used to relieve or prevent spasms (especially of the smooth muscles)verifiedMay 18, 2026
antispyware softwarenounMWEA program that specializes in detecting both malware and non-malware forms of spyware.CapabilityMay 9, 2026
Antistrophenounthe section of a choral ode answering a previous strophe in classical Greek dramaverifiedMay 18, 2026
Antisyphiliticnouna drug (or other chemical agent) that is effective against syphilisverifiedMay 18, 2026
Antitauonnounan antilepton of very great massverifiedMay 18, 2026
Antithesisnounthe juxtaposition of contrasting words or ideas to give a feeling of balanceverifiedMay 18, 2026
Antitoxinnounan antibody that can neutralize a specific toxinverifiedMay 18, 2026
Antitrade WindnounMWEwinds blowing from west to east and lying above the trade winds in the tropicsverifiedMay 18, 2026
Antitradesnounwind in the upper atmosphere blowing above but in the opposite direction from the trade windsverifiedMay 18, 2026
Antitrust CasenounMWEa legal action brought against parties who are charged with limiting free competition in the market placeverifiedMay 18, 2026
Antitrust LawnounMWElaw intended to promote free competition in the market place by outlawing monopoliesverifiedMay 18, 2026
Antitrust LegislationnounMWElaw intended to promote free competition in the market place by outlawing monopoliesverifiedMay 18, 2026
Antitussivenounany medicine used to suppress or relieve coughingverifiedMay 18, 2026
Antitypenouna person or thing represented or foreshadowed by a type or symbolverifiedMay 18, 2026
Antivenenenounan antitoxin that counteracts the effects of venom from the bite of a snake or insect or other animalverifiedMay 18, 2026
Antiveninnounan antitoxin that counteracts the effects of venom from the bite of a snake or insect or other animalverifiedMay 18, 2026
Antiviral AgentnounMWEany drug that destroys virusesverifiedMay 18, 2026
Antiviral DrugnounMWEany drug that destroys virusesverifiedMay 18, 2026
Antivirus softwarenounMWEA program that monitors a computer or network to identify all major types of malware and prevent or contain malware incidents.ControlMay 9, 2026
antivirus update levelnounMWEThe level or version of antivirus software.MetricInternalMay 12, 2026
antivirus update processnounMWEA particular series of actions or steps to bring about an antivirus update.ProcessMay 12, 2026
Antivirus/anti-malware softwarenounMWEA program that monitors a computer or network to identify all types of malware and prevent or contain malware incidents.ThreatMay 9, 2026
Antlernoundeciduous horn of a member of the deer familyverifiedMay 18, 2026
Antler MothnounMWEEuropean moth with white antler-like markings on the forewingsverifiedMay 18, 2026
Antlion FlynounMWEwinged insect resembling a dragonflyverifiedMay 18, 2026
Antonymnouna word that expresses a meaning opposed to the meaning of another word, in which case the two words are antonyms of each otherverifiedMay 18, 2026
Antonymynounthe semantic relation that holds between two words that can (in a given context) express opposite meaningsverifiedMay 18, 2026
Antrumnouna natural cavity or hollow in a boneverifiedMay 18, 2026
Anuresisnouninability to urinateverifiedMay 18, 2026
Anurianouninability to urinateverifiedMay 18, 2026
Anusnounthe excretory opening at the end of the alimentary canalverifiedMay 18, 2026
Anvilnouna heavy block of iron or steel on which hot metals are shaped by hammeringverifiedMay 18, 2026
Anxietynoun(psychiatry) a relatively permanent state of worry and nervousness occurring in a variety of mental disorders, usually accompanied by compulsive behavior or attacks of panicverifiedMay 18, 2026
Anxiety AttacknounMWEa sudden acute episode of intense anxiety and feelings of panicverifiedMay 18, 2026
Anxiety DisordernounMWEa cover term for a variety of mental disorders in which severe anxiety is a salient symptomverifiedMay 18, 2026
Anxiety HysterianounMWEa form of hysteria having features of both conversion disorder and anxiety neurosisverifiedMay 18, 2026
Anxiety NeurosisnounMWEcharacterized by diffuse anxiety and often somatic manifestations of fearverifiedMay 18, 2026
Anxiety ReactionnounMWEan anxiety disorder characterized by chronic free-floating anxiety and such symptoms as tension or sweating or trembling or lightheadedness or irritability etc that has lasted for more than six monthsverifiedMay 18, 2026
Anxiolytic DrugnounMWEa tranquilizer used to relieve anxiety and reduce tension and irritabilityverifiedMay 18, 2026
Anxiousnessnoun(psychiatry) a relatively permanent state of worry and nervousness occurring in a variety of mental disorders, usually accompanied by compulsive behavior or attacks of panicverifiedMay 18, 2026
Any-And-All BidnounMWEa takeover bid where the acquirer offers to buy any and all shares outstandingverifiedMay 18, 2026
Ao DainounMWEthe traditional dress of Vietnamese women consisting of a tunic with long sleeves and panels front and backverifiedMay 18, 2026
Aoristnouna verb tense in some languages (classical Greek and Sanskrit) expressing action (especially past action) without indicating its completion or continuationverifiedMay 18, 2026
Aortanounthe large trunk artery that carries blood from the left ventricle of the heart to branch arteriesverifiedMay 18, 2026
Aortic AneurysmnounMWEan aneurysm of the aortaverifiedMay 18, 2026
Aortic ArchnounMWEthe part of the aorta that arches and turns downwardverifiedMay 18, 2026
Aortic OrificenounMWEthe orifice from the lower left chamber of the heart to the aortaverifiedMay 18, 2026
Aortic PlexusnounMWEa plexus of lymph nodes in the lower portion of the abdominal aortaverifiedMay 18, 2026
Aortic StenosisnounMWEabnormal narrowing of the aortic valveverifiedMay 18, 2026
Aortic ValvenounMWEa semilunar valve between the left ventricle and the aortaverifiedMay 18, 2026
Aortitisnouninflammation of the aortaverifiedMay 18, 2026
Aoudadnounwild sheep of northern AfricaverifiedMay 18, 2026
Apachenouna Parisian gangsterverifiedMay 18, 2026
Apache DancenounMWEa violent fast dance in French vaudeville (an apache is a member of the French underworld)verifiedMay 18, 2026
Apache Devil DancenounMWEa ritual dance of the ApacheverifiedMay 18, 2026
Apadananounthe great hall in ancient Persian palacesverifiedMay 18, 2026
Apanagenouna grant (by a sovereign or a legislative body) of resources to maintain a dependent member of a ruling familyverifiedMay 18, 2026
AparnounSouth American armadillo with three bands of bony platesverifiedMay 18, 2026
Apartheidnouna social policy or racial segregation involving political and economic and legal discrimination against people who are not WhitesverifiedMay 18, 2026
Apartmentnouna suite of rooms usually on one floor of an apartment houseverifiedMay 18, 2026
Apartment BuildingnounMWEa building that is divided into apartmentsverifiedMay 18, 2026
Apartment HousenounMWEa building that is divided into apartmentsverifiedMay 18, 2026
Apatetic ColorationnounMWEcoloring serving as natural camouflageverifiedMay 18, 2026
Apathynounthe trait of lacking enthusiasm for or interest in things generallyverifiedMay 18, 2026
Apatitenouna common complex mineral consisting of calcium fluoride phosphate or calcium chloride phosphateverifiedMay 18, 2026
Apatosaurnounhuge quadrupedal herbivorous dinosaur common in North America in the late JurassicverifiedMay 18, 2026
Apatosaurusnounhuge quadrupedal herbivorous dinosaur common in North America in the late JurassicverifiedMay 18, 2026
Ape-Mannounhypothetical organism formerly thought to be intermediate between apes and human beingsverifiedMay 18, 2026
Apernounsomeone who copies the words or behavior of anotherverifiedMay 18, 2026
Apercunouna short synopsisverifiedMay 18, 2026
ApereanounSouth American cavyverifiedMay 18, 2026