| antiarrhythmic | (noun) a drug used to treat an abnormal heart rhythm | Synonyms: antiarrhythmic drug, antiarrhythmic medication |
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| antilogarithm | (noun) the number of which a given number is the logarithm | Synonyms: antilog |
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| antimetathesis | (noun) A rhetorical figure resulting from a reverted arrangement in the last clause of a sentence of the two principal words of the clause preceding; inversion of the members of an antithesis: as, "A poem is a speaking picture; a picture a mute poem". | - |
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| antipathy | (noun) the object of a feeling of intense aversion; something to be avoided | - |
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| (noun) a feeling of intense dislike | Synonyms: aversion, distaste |
| antithesis | (noun) the juxtaposition of contrasting words or ideas to give a feeling of balance | - |
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| (noun) exact opposite | - |
| apartheid | (noun) a social policy or racial segregation involving political and economic and legal discrimination against people who are not Whites; the former official policy in South Africa | - |
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| apathy | (noun) the trait of lacking enthusiasm for or interest in things generally | Synonyms: indifference, numbness, spiritlessness |
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| (noun) an absence of emotion or enthusiasm | - |
| apophthegm | (noun) a short pithy instructive saying | Synonyms: aphorism, apothegm |
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| apothecary | (noun) a health professional trained in the art of preparing and dispensing drugs | Synonyms: chemist, druggist, pharmacist, pill pusher, pill roller |
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| apothecium | (noun) a cuplike ascocarp in many lichens and ascomycetous fungi | - |
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| apothegm | (noun) a short pithy instructive saying | Synonyms: aphorism, apophthegm |
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| apotheosis | (noun) the elevation of a person (as to the status of a god) | Synonyms: deification, exaltation |
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| (noun) model of excellence or perfection of a kind; one having no equal | Synonyms: ideal, nonesuch, nonpareil, nonsuch, paragon, saint |
| architeuthis | (noun) largest mollusk known about but never seen (to 60 feet long) | Synonyms: giant squid |
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| arethusa | (noun) any of several bog orchids of the genus Arethusa having 1 or 2 showy flowers | - |
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| arishth | (noun) large semi-evergreen tree of the East Indies; trunk exudes a tenacious gum; bitter bark used as a tonic; seeds yield an aromatic oil; sometimes placed in genus Melia | Synonyms: Azadirachta indica, margosa, Melia Azadirachta, neem, neem tree, nim tree |
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| arithmancy | (noun) divination by means of numbers | - |
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| arithmetic | (noun) the branch of pure mathematics dealing with the theory of numerical calculations | - |
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| arithmetician | (noun) someone who specializes in arithmetic | - |
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| aromatherapy | (noun) the therapeutic use of aromatic plant extracts and essential oils in baths or massage | - |
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| arrhythmia | (noun) an abnormal rate of muscle contractions in the heart | Synonyms: cardiac arrhythmia |
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| arrowsmith | (noun) a maker of arrows | - |
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| arthralgia | (noun) pain in a joint or joints | - |
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| arthritic | (noun) a person afflicted with arthritis | - |
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| arthritis | (noun) inflammation of a joint or joints | - |
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| arthrocentesis | (noun) removal of fluid from a joint by centesis | - |
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| arthrodesis | (noun) the surgical fixation of a joint which is intended to result in bone fusion | - |
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| arthrogram | (noun) an X ray of a joint after the injection of a contrast medium | - |
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| arthrography | (noun) roentgenographic examination of a joint after injection of radiopaque contrast medium; produces an arthrogram | - |
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| arthromere | (noun) any of the segments in the body of a jointed animal like an arthropod | - |
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| arthropathy | (noun) a pathology or abnormality of a joint | - |
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| arthroplasty | (noun) surgical reconstruction or replacement of a malformed or degenerated joint | - |
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| arthropod | (noun) invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin | - |
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| arthroscope | (noun) a type of endoscope that is inserted into a joint for visual examination | - |
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| arthroscopy | (noun) a minimally invasive operation to repair a damaged joint; the surgeon examines the joint with an arthroscope while making repairs through a small incision | - |
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| arthrospore | (noun) one of a string of thick walled vegetative resting cells formed by some algae and fungi | - |
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| (noun) a body that resembles a spore but is not an endospore; produced by some bacteria | - |
| asthenia | (noun) an abnormal loss of strength | Synonyms: astheny |
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| asthenopia | (noun) a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem | Synonyms: eyestrain |
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| asthenosphere | (noun) the lower layer of the crust | - |
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| astheny | (noun) an abnormal loss of strength | Synonyms: asthenia |
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| asthma | (noun) respiratory disorder characterized by wheezing; usually of allergic origin | Synonyms: asthma attack, bronchial asthma |
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| asthmatic | (noun) a person suffering from asthma | - |
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| athanor | (noun) a furnace that feeds itself so as to maintain a uniform temperature; used by alchemists | - |
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| athar | (noun) essential oil or perfume obtained from flowers | Synonyms: atar, attar, ottar |
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| atheism | (noun) a lack of belief in the existence of God or gods | - |
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| atheist | (noun) someone who does not believe in the existence of a god | - |
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| athenaeum | (noun) a place where reading materials are available | Synonyms: atheneum |
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| (noun) a literary or scientific association for the promotion of learning | Synonyms: atheneum |
| atheneum | (noun) a place where reading materials are available | Synonyms: athenaeum |
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| (noun) a literary or scientific association for the promotion of learning | Synonyms: athenaeum |
| atherodyde | (noun) a simple type of jet engine; must be launched at high speed | Synonyms: athodyd, flying drainpipe, ramjet, ramjet engine |
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| atherogenesis | (noun) the formation of atheromas on the walls of the arteries as in atherosclerosis | - |
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| atheroma | (noun) a fatty deposit in the intima (inner lining) of an artery; can obstruct blood flow | - |
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| atherosclerosis | (noun) a stage of arteriosclerosis involving fatty deposits (atheromas) inside the arterial walls, thus narrowing the arteries | Synonyms: coronary artery disease |
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| athetosis | (noun) a continuous succession of slow, writhing, involuntary movements of the hands and feet and other body parts | - |
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| athlete | (noun) a person trained to compete in sports | Synonyms: jock |
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| athleticism | (noun) intense energy | Synonyms: strenuosity |
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| athletics | (noun) an active diversion requiring physical exertion and competition | Synonyms: sport |
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| (noun) participation in sports events as an extracurricular activity | - |
| (noun) a contest between athletes | Synonyms: athletic competition, athletic contest |
| athodyd | (noun) a simple type of jet engine; must be launched at high speed | Synonyms: atherodyde, flying drainpipe, ramjet, ramjet engine |
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| australopithecine | (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
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| authentication | (noun) validating the authenticity of something or someone | Synonyms: certification |
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| (noun) a mark on an article of trade to indicate its origin and authenticity | Synonyms: assay-mark, hallmark |
| authenticator | (noun) one who determines authenticity (as of works of art) or who guarantees validity | Synonyms: appraiser |
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| authenticity | (noun) undisputed credibility | Synonyms: genuineness, legitimacy |
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| author | (noun) writes (books or stories or articles or the like) professionally (for pay) | Synonyms: writer |
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| (noun) someone who originates or causes or initiates something | Synonyms: generator, source |
| authoress | (noun) a woman author | - |
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| authorisation | (noun) the act of conferring legality or sanction or formal warrant | Synonyms: authorization, empowerment |
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| (noun) the power or right to give orders or make decisions | Synonyms: authority, authorization, dominance, potency, say-so |
| (noun) official permission or approval | Synonyms: authority, authorization, sanction |
| (noun) a document giving an official instruction or command | Synonyms: authorization, mandate |
| authoriser | (noun) an authority who authorizes (people or actions) | Synonyms: authorizer |
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| authoritarian | (noun) a person who behaves in a tyrannical manner | Synonyms: dictator |
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| authoritarianism | (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: absolutism, Caesarism, despotism, dictatorship, monocracy, one-man rule, shogunate, Stalinism, totalitarianism, tyranny |
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| authorities | (noun) the organization that is the governing authority of a political unit | Synonyms: government, regime |
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| authority | (noun) the power or right to give orders or make decisions | Synonyms: authorisation, authorization, dominance, potency, say-so |
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| (noun) official permission or approval | Synonyms: authorisation, authorization, sanction |
| (noun) freedom from doubt; belief in yourself and your abilities | Synonyms: assurance, confidence, self-assurance, self-confidence, sureness |
| (noun) an authoritative written work | - |
| (noun) an administrative unit of government | Synonyms: agency, bureau, federal agency, government agency, office |
| (noun) an expert whose views are taken as definitive | - |
| (noun) (usually plural) persons who exercise (administrative) control over others | - |
| authorization | (noun) the act of conferring legality or sanction or formal warrant | Synonyms: authorisation, empowerment |
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| (noun) the power or right to give orders or make decisions | Synonyms: authorisation, authority, dominance, potency, say-so |
| (noun) official permission or approval | Synonyms: authorisation, authority, sanction |
| (noun) a document giving an official instruction or command | Synonyms: authorisation, mandate |
| authorizer | (noun) an authority who authorizes (people or actions) | Synonyms: authoriser |
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| authorship | (noun) the act of creating written works | Synonyms: composition, penning, writing |
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| (noun) the act of initiating a new idea or theory or writing | Synonyms: paternity |
| autochthon | (noun) the earliest known inhabitants of a region | - |
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| autochthony | (noun) nativeness by virtue of originating or occurring naturally (as in a particular place) | Synonyms: endemism, indigenousness |
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| axerophthol | (noun) any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes | Synonyms: A, antiophthalmic factor, vitamin A |
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| azathioprine | (noun) an immunosuppressive drug (trade name Imuran) used to prevent rejection of a transplanted organ | Synonyms: Imuran |
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| azimuth | (noun) the azimuth of a celestial body is the angle between the vertical plane containing it and the plane of the meridian | Synonyms: AZ |
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| azithromycin | (noun) a systemic antibacterial medicine (trade name Zithromax) that is prescribed to treat bacterial infections in many different parts of the body | Synonyms: Zithromax |
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| backcloth | (noun) scenery hung at back of stage | Synonyms: backdrop, background |
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| balanoposthitis | (noun) inflammation of both the head of the penis and the foreskin | - |
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| bandwidth | (noun) a data transmission rate; the maximum amount of information (bits/second) that can be transmitted along a channel | - |
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| bath | (noun) a soaking and washing in a bathtub | - |
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| (noun) a vessel containing liquid in which something is immersed (as to process it or to maintain it at a constant temperature or to lubricate it) | - |
| (noun) an ancient Hebrew liquid measure equal to about 10 gallons | - |
| bathe | (noun) the act of swimming for pleasure or recreation | - |
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| bather | (noun) a person who travels through the water by swimming | Synonyms: natator, swimmer |
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| (noun) a person who takes a bath | - |
| bathhouse | (noun) a building containing public baths | Synonyms: bagnio |
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| (noun) a building containing dressing rooms for bathers | Synonyms: bathing machine |
| bathing | (noun) immersing the body in water or sunshine | - |
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| (noun) the act of washing yourself (or another person) | Synonyms: washup |
| batholite | (noun) large mass of intrusive igneous rock believed to have solidified deep within the earth | Synonyms: batholith, pluton, plutonic rock |
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| batholith | (noun) large mass of intrusive igneous rock believed to have solidified deep within the earth | Synonyms: batholite, pluton, plutonic rock |
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| bathometer | (noun) an instrument that measures the depth of water | Synonyms: bathymeter |
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| bathos | (noun) triteness or triviality of style | - |
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| (noun) a change from a serious subject to a disappointing one | Synonyms: anticlimax |
| (noun) insincere pathos | Synonyms: mawkishness |
| bathrobe | (noun) a loose-fitting robe of towelling; worn after a bath or swim | - |
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| bathroom | (noun) a room (as in a residence) containing a bathtub or shower and usually a washbasin and toilet | - |
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| (noun) a room or building equipped with one or more toilets | Synonyms: can, john, lav, lavatory, privy, toilet |
| bathtub | (noun) a relatively large open container that you fill with water and use to wash the body | Synonyms: bathing tub, tub |
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| bathymeter | (noun) an instrument that measures the depth of water | Synonyms: bathometer |
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| bathymetry | (noun) measuring the depths of the oceans | Synonyms: plumbing |
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| bathyscape | (noun) navigable deep diving vessel for underwater exploration | Synonyms: bathyscaph, bathyscaphe |
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| bathyscaph | (noun) navigable deep diving vessel for underwater exploration | Synonyms: bathyscape, bathyscaphe |
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| bathyscaphe | (noun) navigable deep diving vessel for underwater exploration | Synonyms: bathyscape, bathyscaph |
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| bathysphere | (noun) spherical deep diving apparatus (lowered by a cable) for underwater exploration | - |
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| bedclothes | (noun) coverings that are used on a bed | Synonyms: bed clothing, bedding |
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| behemoth | (noun) someone that is abnormally large and powerful | Synonyms: colossus, giant, goliath, monster |
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| (noun) a person of exceptional importance and reputation | Synonyms: colossus, giant, heavyweight, titan |