Glossary · Nouns · A
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TermTypeDefinitionClassificationsUpdated
Amethopterinnountoxic antimetabolite that limits cellular reproduction by acting as an antagonist to folic acidverified
Ametropianoun(ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopiaverified
Amicus CuriaenounMWEan adviser to the court on some matter of law who is not a party to the caseverified
Amicus Curiae BriefnounMWEa brief presented by someone interested in influencing the outcome of a lawsuit but who is not a party to itverified
Aminenouna compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicalsverified
Aminoalkanenouna compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicalsverified
Aminoalkanoic AcidnounMWEorganic compounds containing an amino group and a carboxylic acid groupverified
Aminopherasenouna class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound)verified
Aminophyllinenouna theophylline derivative that is used as a bronchodilator in the treatment of bronchial asthma, emphysema, and bronchitisverified
Aminotransferasenouna class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound)verified
Amiodaronenounan antiarrhythmic drug (trade name Cordarone) that has potentially fatal side effects and is used to control serious heart rhythm problems only when safer agents have been ineffectiveverified
Amitosisnounthe direct method of cell division characterized by simple division of the nucleus without formation of chromosomesverified
Amitriptylinenouna tricyclic antidepressant drug (trade name Elavil) with serious side effectsverified
Amitriptyline HydrochloridenounMWEa tricyclic antidepressant drug (trade name Elavil) with serious side effectsverified
Ammonia AlumnounMWEa white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminumverified
Ammonia ClocknounMWEan atomic clock based on vibrational frequency of the nitrogen atom in the ammonia moleculeverified
Ammonium AlumnounMWEa white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminumverified
Ammunitionnounany nuclear or chemical or biological material that can be used as a weapon of mass destructionverified
Amnesic AphasianounMWEinability to name objects or to recognize written or spoken names of objectsverified
Amnestic AphasianounMWEinability to name objects or to recognize written or spoken names of objectsverified
Amnionounin medicine, the extraction by centesis of amniotic fluid from a pregnant woman - generally after the 15th week of pregnancy - to aid in the diagnosis of fetal abnormalitiesverified
Amniocentesisnoun(pregnancy) extraction by centesis of amniotic fluid from a pregnant woman (after the 15th week of pregnancy) to aid in the diagnosis of fetal abnormalitiesverified
Amnionnounthin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)verified
Amniotic SacnounMWEthin innermost membranous sac enclosing the developing embryo of higher vertebratesverified
Amoebanounnaked freshwater or marine or parasitic protozoa that form temporary pseudopods for feeding and locomotionverified
Amoranounone of a group of rabbis (active AD 250-500) who discussed the Mishnaic law in the law schools of Palestine and Mesopotamia where they explained and applied earlier teachings and whose discussions are recorded in the Talmudverified
Amoralistnounsomeone who adheres to the doctrine that ordinary moral distinctions are invalidverified
Amorphanounany plant of the genus Amorpha having odd-pinnate leaves and purplish spicate flowersverified
Amortisationnounthe reduction of the value of an asset by prorating its cost over a period of yearsverified
Amortizationnounthe reduction of the value of an asset by prorating its cost over a period of yearsverified
Amperenounthe basic unit of electric current adopted under the Systeme International d'Unitesverified
Ampere-Secondnouna unit of electrical charge equal to the amount of charge transferred by a current of 1 ampere in 1 secondverified
Ampere-Turnnouna unit of magnetomotive force equal to the magnetomotive force produced by the passage of 1 ampere through 1 complete turn of a coilverified
Amphetaminenouna central nervous system stimulant that increases energy and decreases appetiteverified
Amphetamine SulfatenounMWEa sulfate derivative of amphetamine that is used as a stimulant for the central nervous systemverified
Amphetamine SulphatenounMWEa sulfate derivative of amphetamine that is used as a stimulant for the central nervous systemverified