| arthropod | (noun) invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin | - |
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| arthropodal | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodan, arthropodous |
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| arthropodan | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodous |
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| arthropodous | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodan |
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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 | - |
| arthrosporic | (adjective) of or relating to arthrospores | Synonyms: arthrosporous |
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| arthrosporous | (adjective) of or relating to arthrospores | Synonyms: arthrosporic |
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| asthenia | (noun) an abnormal loss of strength | Synonyms: astheny |
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| asthenic | (adjective) having a slender physique | - |
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| (adjective) lacking energy or vitality | Synonyms: adynamic, debilitated, enervated |
| 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 | (adjective) relating to breathing with a whistling sound | Synonyms: wheezing, wheezy |
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| (noun) a person suffering from asthma | - |
| 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 | (adjective) related to or characterized by or given to atheism | Synonyms: atheistic, atheistical |
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| (noun) someone who does not believe in the existence of a god | - |
| atheistic | (adjective) related to or characterized by or given to atheism | Synonyms: atheist, atheistical |
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| (adjective) rejecting any belief in gods | Synonyms: atheistical, unbelieving |
| atheistical | (adjective) related to or characterized by or given to atheism | Synonyms: atheist, atheistic |
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| (adjective) rejecting any belief in gods | Synonyms: atheistic, unbelieving |
| 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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| atheromatic | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatous |
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| atheromatous | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatic |
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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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| atherosclerotic | (adjective) of or relating to atherosclerosis | - |
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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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| athirst | (adjective) (usually followed by `for') extremely desirous | Synonyms: hungry, thirsty |
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| athlete | (noun) a person trained to compete in sports | Synonyms: jock |
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| athletic | (adjective) relating to or befitting athletics or athletes | - |
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| (adjective) vigorously active | Synonyms: acrobatic, gymnastic |
| (adjective) having a sturdy and well proportioned body | - |
| 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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| athwart | (adverb) at an oblique angle | Synonyms: aslant, obliquely |
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| (adverb) at right angles to the center line of a ship | - |
| australopithecine | (adjective) of or belonging to the hominid genus Australopithecus | - |
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| (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
| authentic | (adjective) not counterfeit or copied | Synonyms: bona fide, unquestionable, veritable |
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| (adjective) conforming to fact and therefore worthy of belief | Synonyms: reliable |
| authentically | (adverb) genuinely; with authority | Synonyms: genuinely |
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| authenticate | (verb) establish the authenticity of something | - |
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| authenticated | (adjective) established as genuine | Synonyms: attested, documented |
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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 |
| (verb) be the author of | - |
| authoress | (noun) a woman author | - |
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| authorial | (adjective) of or by or typical of an author | Synonyms: auctorial |
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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 |
| authorise | (verb) grant authorization or clearance for | Synonyms: authorize, clear, pass |
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| (verb) give or delegate power or authority to | Synonyms: authorize, empower |
| authorised | (adjective) endowed with authority | Synonyms: authoritative, authorized |
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| authoriser | (noun) an authority who authorizes (people or actions) | Synonyms: authorizer |
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| authoritarian | (adjective) expecting unquestioning obedience | Synonyms: dictatorial, overbearing |
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| (adjective) characteristic of an absolute ruler or absolute rule; having absolute sovereignty | Synonyms: autocratic, despotic, dictatorial, tyrannic, tyrannical |
| (noun) a person who behaves in a tyrannical manner | Synonyms: dictator |
| 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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| authoritative | (adjective) endowed with authority | Synonyms: authorised, authorized |
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| (adjective) having authority or ascendancy or influence | Synonyms: important |
| (adjective) of recognized authority or excellence | Synonyms: definitive |
| authoritatively | (adverb) in an authoritative and magisterial manner | Synonyms: magisterially |
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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 |
| authorize | (verb) grant authorization or clearance for | Synonyms: authorise, clear, pass |
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| (verb) give or delegate power or authority to | Synonyms: authorise, empower |
| authorized | (adjective) endowed with authority | Synonyms: authorised, authoritative |
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| 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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| autochthonal | (adjective) originating where it is found | Synonyms: autochthonic, autochthonous, endemic, indigenous |
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| autochthonic | (adjective) originating where it is found | Synonyms: autochthonal, autochthonous, endemic, indigenous |
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| autochthonous | (adjective) of rocks, deposits, etc.; found where they and their constituents were formed | - |
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| (adjective) originating where it is found | Synonyms: autochthonal, autochthonic, endemic, indigenous |
| 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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| azimuthal | (adjective) of or relating to or in azimuth | - |
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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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| badmouth | (verb) speak unfavorably about | Synonyms: drag through the mud, malign, traduce |
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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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| (verb) cleanse the entire body | - |
| (verb) suffuse or envelope with something | - |
| (verb) swim for pleasure or recreation | - |
| 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 | - |
| bathetic | (adjective) effusively or insincerely emotional | Synonyms: drippy, hokey, kitschy, maudlin, mawkish, mushy, sappy, schmaltzy, schmalzy, sentimental, slushy, soppy, soupy |
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| 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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| batholithic | (adjective) of or relating to a batholith | Synonyms: batholitic |
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| batholitic | (adjective) of or relating to a batholith | Synonyms: batholithic |
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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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| bathyal | (adjective) relating to ocean depths between 200 and 2000 meters (corresponds to the continental slope) | - |
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| bathymeter | (noun) an instrument that measures the depth of water | Synonyms: bathometer |
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| bathymetric | (adjective) of or relating to measurements of the depths of oceans or lakes | Synonyms: bathymetrical |
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| bathymetrical | (adjective) of or relating to measurements of the depths of oceans or lakes | Synonyms: bathymetric |
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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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