Glossary · Nouns · A
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TermTypeDefinitionClassificationsUpdated
Andraditenouna garnet consisting of calcium iron silicate and having any color ranging from yellow and green to brown and blackverified
Androgennounmale sex hormone that is produced in the testes and responsible for typical male sexual characteristicsverified
Androgenesisnounmale parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilizationverified
Androgenic HormonenounMWEmale sex hormone that is produced in the testes and responsible for typical male sexual characteristicsverified
Androgenynounmale parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilizationverified
Andromedanounany of several shrubs of the genus Andromeda having leathery leaves and clusters of small flowersverified
Andryalanounany plant of the genus Andryala having milky sap and heads of bright yellow flowersverified
Anemonenounany woodland plant of the genus Anemone grown for its beautiful flowers and whorls of dissected leavesverified
Anencephalianouna defect in brain development resulting in small or missing brain hemispheresverified
Anencephalynouna defect in brain development resulting in small or missing brain hemispheresverified
Anesthesiologistnouna specialist who administers an anesthetic to a patient before he is treatedverified
Anestrumnounapplies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrusverified
Anestrusnounapplies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrusverified
Aneuploidynounan abnormality involving a chromosome number that is not an exact multiple of the haploid number (one chromosome set is incomplete)verified
Aneurismnouna cardiovascular disease characterized by a saclike widening of an artery resulting from weakening of the artery wallverified
Aneurysmnouna cardiovascular disease characterized by a saclike widening of an artery resulting from weakening of the artery wallverified
Angel SharknounMWEsharks with broad flat bodies and winglike pectoral fins but that swim the way sharks doverified
Angel-Wing BegonianounMWESouth American fibrous-rooted begonias having prominent basal leaf lobes suggesting angels' wings and racemes of coral-red flowersverified
Angel's TrumpetnounMWESouth American plant cultivated for its very large nocturnally fragrant trumpet-shaped flowersverified
Angelfishnounsharks with broad flat bodies and winglike pectoral fins but that swim the way sharks doverified
Angelicanounany of various tall and stout herbs of the genus Angelica having pinnately compound leaves and small white or greenish flowers in compound umbelsverified
Angeliquenounany of various tall and stout herbs of the genus Angelica having pinnately compound leaves and small white or greenish flowers in compound umbelsverified
Angelusnounthe sound of a bell rung in Roman Catholic churches to announce the time when the Angelus should be recitedverified
Angelus BellnounMWEthe sound of a bell rung in Roman Catholic churches to announce the time when the Angelus should be recitedverified
Anginanounany disease of the throat or fauces marked by spasmodic attacks of intense suffocative painverified
Angina PectorisnounMWEa heart condition marked by paroxysms of chest pain due to reduced oxygen to the heartverified
Angiocardiogramnouna series of X rays representing the action of the heart and its blood vessels after the injection of a radiopaque substanceverified
Angiogenesis InhibitornounMWEa drug that is designed to prevent the growth of blood vessels that nourish tumorsverified
Angiogramnounan X-ray representation of blood vessels made after the injection of a radiopaque substanceverified
Angiographynounroentgenographic examination of blood vessels after injection of a radiopaque contrast mediumverified
Angiologynounthe branch of medical science that studies the blood and lymph vessels and their disordersverified
Angiopterisnounhighly variable species of very large primitive ferns of the Pacific tropical areas with high rainfallverified
Angiotensinnounany of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vesselsverified
Angiotensin Converting EnzymenounMWEproteolytic enzyme that converts angiotensin I into angiotensin IIverified
Angiotensin InounMWEa physiologically inactive form of angiotensin that is the precursor to angiotensin IIverified
Angiotensin II InhibitornounMWEan agent that retards or restrains the action of angiotensin IIverified
Angiotensin-Converting Enzyme InhibitornounMWEan antihypertensive drug that blocks the formation of angiotensin II in the kidney, leading to relaxation of the arteriesverified
Angiotoninnounany of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vesselsverified
Angle BracketnounMWEeither of two punctuation marks (`<' or `>') used in computer programming and sometimes used to enclose textual materialverified
Angle of AttacknounMWEthe acute angle between the direction of the undisturbed relative wind and the chord of an airfoilverified
Angle of DipnounMWE(physics) the angle that a magnetic needle makes with the plane of the horizonverified
Angle of ExtinctionnounMWEthe angle from its axis that a crystal must be rotated before appearing maximally dark when viewed in polarized lightverified
Angle of IncidencenounMWEthe angle that a line makes with a line perpendicular to the surface at the point of incidenceverified
Angle of InclinationnounMWE(geometry) the angle formed by the x-axis and a given line (measured counterclockwise from the positive half of the x-axis)verified
Angle of ReflectionnounMWEthe angle between a reflected ray and a line perpendicular to the reflecting surface at the point of incidenceverified
Angle of RefractionnounMWEthe angle between a refracted ray and a line perpendicular to the surface between the two media at the point of refractionverified