Glossary · Nouns · A
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TermTypeDefinitionClassificationsUpdated
Atherogenesisnounthe formation of atheromas on the walls of the arteries as in atherosclerosisverified
Atherosclerosisnouna stage of arteriosclerosis involving fatty deposits (atheromas) inside the arterial walls, thus narrowing the arteriesverified
Athetosisnouna continuous succession of slow, writhing, involuntary movements of the hands and feet and other body partsverified
Athletic SupporternounMWEa support for the genitals worn by men engaging in strenuous exerciseverified
Athletic TrainingnounMWEthe course of practice and exercise and diet undertaken by an athleteverified
Atmnouna unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigradeverified
Atmospherenouna unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigradeverified
Atmospheric ConditionnounMWEthe atmospheric conditions that comprise the state of the atmosphere in terms of temperature and wind and clouds and precipitationverified
Atom BombnounMWEa nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element like uranium 235 or plutonium 239)verified
Atom SmashernounMWEa scientific instrument that increases the kinetic energy of charged particlesverified
Atomic BombnounMWEa nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element like uranium 235 or plutonium 239)verified
Atomic ClocknounMWEa timepiece that derives its time scale from the vibration of atoms or moleculesverified
Atomic CocktailnounMWEan oral dose of radioactive substance used in treatment and diagnosis of cancerverified
Atomic MassnounMWE(chemistry) the mass of an atom of a chemical element expressed in atomic mass unitsverified
Atomic PhysicsnounMWEthe branch of physics that studies the internal structure of atomic nucleiverified
Atomic PowernounMWEnuclear energy regarded as a source of electricity for the civilian power gridverified
Atomic ReactornounMWEa nuclear reactor that uses controlled nuclear fission to generate energyverified
Atomic SpectrumnounMWE(physics) a spectrum of radiation caused by electron transitions within an atomverified
Atomic TheorynounMWEany theory in which all matter is composed of tiny discrete finite indivisible indestructible particlesverified
Atomic WeaponnounMWEa weapon of mass destruction whose explosive power derives from a nuclear reactionverified
Atomic WeightnounMWE(chemistry) the mass of an atom of a chemical element expressed in atomic mass unitsverified
Atomismnoun(psychology) a theory that reduces all mental phenomena to simple elements (sensations and feelings) that form complex ideas by associationverified
Atomist TheorynounMWEany theory in which all matter is composed of discrete, finite, indivisible, and indestructible particlesverified
Atomistic TheorynounMWE(chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particlesverified
Atopic AllergynounMWEan allergic reaction that becomes apparent in a sensitized person only minutes after contactverified
Atopynounan allergic reaction that becomes apparent in a sensitized person only minutes after contactverified
Atorvastatinnounan oral drug (trade name Lipitor) that is effective in lowering triglyceridesverified
Atrazinenouna synthetic compound derived from triazine that is widely used as an agricultural herbicideverified
Atresianounan abnormal condition in which a normal opening or tube in the body (as the urethra) is closed or absentverified
Atrial ArterynounMWEthe branch of the coronary artery that supplies the muscles of the atriaverified
Atrial AuriclenounMWEa small conical pouch projecting from the upper anterior part of each atrium of the heartverified
Atrial Septal DefectnounMWEan abnormal opening between the left and right atria of the heartverified
Atrioventricular BundlenounMWEa bundle of modified heart muscle that transmits the cardiac impulse from the atrioventricular node to the ventricles causing them to contractverified
Atrioventricular Nodal RhythmnounMWEthe normal cardiac rhythm when the heart is controlled by the atrioventricular nodeverified
Atrioventricular NodenounMWEa node of specialized heart muscle located in the septal wall of the right atriumverified
Atrioventricular TrunknounMWEa bundle of modified heart muscle that transmits the cardiac impulse from the atrioventricular node to the ventricles causing them to contractverified
Atrioventricular ValvenounMWEeither of two heart valves through which blood flows from the atria to the ventriclesverified
Atriumnounany chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart)verified
Atrium DextrumnounMWEthe right upper chamber of the heart that receives blood from the venae cavae and coronary sinusverified
Atrium SinistrumnounMWEthe left upper chamber of the heart that receives blood from the pulmonary veinsverified
Atrophic ArthritisnounMWEa chronic autoimmune disease with inflammation of the joints and marked deformitiesverified