| argentiferous | (adjective) containing or yielding silver | - |
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| arguer | (noun) someone who engages in debate | Synonyms: debater |
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| armiger | (noun) a squire carrying the armor of a knight | Synonyms: armor-bearer |
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| (noun) a nobleman entitled to bear heraldic arms | - |
| armorer | (noun) a manufacturer of firearms | Synonyms: armourer |
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| (noun) an enlisted man responsible for the upkeep of small arms and machine guns etc. | Synonyms: armourer, artificer |
| (noun) a worker skilled in making armor or arms | Synonyms: armourer |
| armourer | (noun) a manufacturer of firearms | Synonyms: armorer |
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| (noun) an enlisted man responsible for the upkeep of small arms and machine guns etc. | Synonyms: armorer, artificer |
| (noun) a worker skilled in making armor or arms | Synonyms: armorer |
| aromatherapy | (noun) the therapeutic use of aromatic plant extracts and essential oils in baths or massage | - |
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| arouser | (noun) someone who rouses others from sleep | Synonyms: rouser, waker |
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| arranger | (noun) a person who brings order and organization to an enterprise | Synonyms: organiser, organizer |
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| (noun) a musician who adapts a composition for particular voices or instruments or for another style of performance | Synonyms: adapter, transcriber |
| arrester | (noun) a restraint that slows airplanes as they land on the flight deck of an aircraft carrier | Synonyms: arrester hook |
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| arrivederci | (noun) a farewell remark | Synonyms: adieu, adios, au revoir, auf wiedersehen, bye-bye, bye, cheerio, good-by, good-bye, good day, goodby, goodbye, sayonara, so long |
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| arriver | (noun) someone who arrives (or has arrived) | Synonyms: arrival, comer |
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| arteria | (noun) a blood vessel that carries blood from the heart to the body | Synonyms: arterial blood vessel, artery |
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| arterial | (adjective) of or involving or contained in the arteries | - |
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| arterialise | (verb) change venous blood into arterial blood | Synonyms: arterialize |
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| arterialize | (verb) change venous blood into arterial blood | Synonyms: arterialise |
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| arteriectasia | (noun) an abnormal distension of an artery | Synonyms: arteriectasis |
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| arteriectasis | (noun) an abnormal distension of an artery | Synonyms: arteriectasia |
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| arteriogram | (noun) an X ray of an artery filled with a contrast medium | - |
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| arteriography | (noun) roentgenographic examination of arteries | - |
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| arteriola | (noun) one of the small thin-walled arteries that end in capillaries | Synonyms: arteriole, capillary artery |
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| arteriolar | (adjective) of or relating to or involving arterioles | - |
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| arteriole | (noun) one of the small thin-walled arteries that end in capillaries | Synonyms: arteriola, capillary artery |
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| arteriolosclerosis | (noun) sclerosis of the arterioles | - |
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| arteriosclerosis | (noun) sclerosis of the arterial walls | Synonyms: arterial sclerosis, coronary-artery disease, hardening of the arteries, induration of the arteries |
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| arteriosclerotic | (adjective) affected by arteriosclerosis | - |
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| arteriovenous | (adjective) connecting an artery to a vein | - |
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| arteritis | (noun) inflammation of an artery | - |
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| artery | (noun) a major thoroughfare that bears important traffic | - |
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| (noun) a blood vessel that carries blood from the heart to the body | Synonyms: arteria, arterial blood vessel |
| arthromere | (noun) any of the segments in the body of a jointed animal like an arthropod | - |
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| arthromeric | (adjective) of or relating to one of the body segments of jointed animals | - |
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| artificer | (noun) a skilled worker who practices some trade or handicraft | Synonyms: artisan, craftsman, journeyman |
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| (noun) someone who is the first to think of or make something | Synonyms: discoverer, inventor |
| (noun) an enlisted man responsible for the upkeep of small arms and machine guns etc. | Synonyms: armorer, armourer |
| artillery | (noun) large but transportable armament | Synonyms: gun, heavy weapon, ordnance |
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| (noun) a means of persuading or arguing | Synonyms: weapon |
| (noun) an army unit that uses big guns | Synonyms: artillery unit |
| artilleryman | (noun) a serviceman in the artillery | Synonyms: cannoneer, gunner, machine gunner |
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| ascender | (noun) (printing) the part of tall lowercase letters that extends above the other lowercase letters | - |
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| (noun) a lowercase letter that has a part extending above other lowercase letters | - |
| (noun) someone who ascends | - |
| ascertain | (verb) be careful or certain to do something; make certain of something | Synonyms: assure, check, control, ensure, insure, see, see to it |
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| (verb) learn or discover with certainty | - |
| (verb) find out, learn, or determine with certainty, usually by making an inquiry or other effort | Synonyms: check, determine, find out, learn, see, watch |
| (verb) establish after a calculation, investigation, experiment, survey, or study | Synonyms: determine, find, find out |
| ascertainable | (adjective) capable of being ascertained or found out | Synonyms: discoverable |
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| ascertained | (adjective) discovered or determined by scientific observation | Synonyms: discovered, observed |
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| asker | (noun) someone who asks a question | Synonyms: enquirer, inquirer, querier, questioner |
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| asper | (noun) 20 aspers equal 1 kurus in Turkey | - |
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| aspergill | (noun) a short-handled device with a globe containing a sponge; used for sprinkling holy water | Synonyms: aspersorium |
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| aspergillosis | (noun) an opportunistic infection by a fungus of the genus Aspergillus; characterized by inflammation and lesions of the ear and other organs | - |
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| (noun) disease especially in agricultural workers caused by inhalation of Aspergillus spores causing lumps in skin and ears and respiratory organs | - |
| (noun) severe respiratory disease of birds that takes the form of an acute rapidly fatal pneumonia in young chickens and turkeys | Synonyms: brooder pneumonia |
| asperity | (noun) something hard to endure | Synonyms: grimness, hardship, rigor, rigorousness, rigour, rigourousness, severeness, severity |
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| (noun) harshness of manner | Synonyms: sharpness |
| asperse | (verb) charge falsely or with malicious intent; attack the good name and reputation of someone | Synonyms: besmirch, calumniate, defame, denigrate, slander, smear, smirch, sully |
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| aspersion | (noun) an abusive attack on a person's character or good name | Synonyms: calumny, defamation, denigration, slander |
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| (noun) the act of sprinkling water in baptism (rare) | Synonyms: sprinkling |
| (noun) a disparaging remark | Synonyms: slur |
| aspersorium | (noun) the basin or other vessel that holds holy water in Roman Catholic Churches | - |
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| (noun) a short-handled device with a globe containing a sponge; used for sprinkling holy water | Synonyms: aspergill |
| aspheric | (adjective) varying slightly from a perfectly spherical shape | Synonyms: aspherical |
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| aspherical | (adjective) varying slightly from a perfectly spherical shape | Synonyms: aspheric |
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| aspirer | (noun) an ambitious and aspiring young person | Synonyms: aspirant, hopeful, wannabe, wannabee |
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| assaulter | (noun) someone who attacks | Synonyms: aggressor, assailant, attacker |
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| assayer | (noun) an analyst who assays (performs chemical tests on) metals | - |
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| assembler | (noun) a program to convert assembly language into machine language | Synonyms: assembly program |
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| assenter | (noun) a person who assents | - |
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| assert | (verb) postulate positively and assertively | Synonyms: insist |
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| (verb) to declare or affirm solemnly and formally as true | Synonyms: affirm, aver, avow, swan, swear, verify |
| (verb) state categorically | Synonyms: asseverate, maintain |
| (verb) insist on having one's opinions and rights recognized | Synonyms: put forward |
| assertable | (adjective) capable of being affirmed or asserted | Synonyms: affirmable |
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| asserted | (adjective) confidently declared to be so | - |
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| asserter | (noun) someone who claims to speak the truth | Synonyms: affirmer, asseverator, avower, declarer |
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| asserting | (adjective) relating to the use of or having the nature of a declaration | Synonyms: declarative, declaratory |
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| assertion | (noun) a declaration that is made emphatically (as if no supporting evidence were necessary) | Synonyms: asseveration, averment |
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| (noun) the act of affirming or asserting or stating something | Synonyms: affirmation, statement |
| assertive | (adjective) aggressively self-assured | Synonyms: self-asserting, self-assertive |
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| assertively | (adverb) in an assertive manner | - |
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| assertiveness | (noun) aggressive self-assurance; given to making bold assertions | Synonyms: self-assertiveness |
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| asseverate | (verb) state categorically | Synonyms: assert, maintain |
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| asseveration | (noun) a declaration that is made emphatically (as if no supporting evidence were necessary) | Synonyms: assertion, averment |
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| asseverator | (noun) someone who claims to speak the truth | Synonyms: affirmer, asserter, avower, declarer |
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| aster | (noun) star-shaped structure formed in the cytoplasm of a cell having fibers like rays that surround the centrosome during mitosis | - |
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| (noun) any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers | - |
| astereognosis | (noun) a loss of the ability to recognize objects by handling them | Synonyms: tactile agnosia |
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| asteriated | (adjective) (of some crystals especially gemstones) exhibiting asterism | - |
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| asterion | (noun) the craniometric point at the junction of the lamboid suture and the occipitomastoid suture and the parietomastoid suture | - |
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| asterisk | (noun) a star-shaped character * used in printing | Synonyms: star |
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| (verb) mark with an asterisk | Synonyms: star |
| asterisked | (adjective) marked with an asterisk | Synonyms: starred |
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| asterism | (noun) (astronomy) a cluster of stars (or a small constellation) | - |
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| (noun) (mineralogy) a star-shaped figure with six rays that is seen in some crystal structures under reflected or transmitted light | - |
| asterismal | (adjective) relating to asterisms or constellations | - |
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| astern | (adverb) (of a ship or an airplane) behind | - |
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| (adverb) at or near or toward the stern of a ship or tail of an airplane | Synonyms: abaft, aft |
| (adverb) stern foremost or backward | - |
| asternal | (adjective) not connected to the sternum or breastbone | - |
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| asteroid | (adjective) shaped like a star | Synonyms: star-shaped |
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| (noun) any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter) | - |
| asteroidal | (adjective) of or relating to or resembling an asteroid | - |
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| asthenosphere | (noun) the lower layer of the crust | - |
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| astrologer | (noun) someone who predicts the future by the positions of the planets and sun and Moon | Synonyms: astrologist |
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| astronomer | (noun) a physicist who studies astronomy | Synonyms: stargazer, uranologist |
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| asunder | (adjective) widely separated especially in space | - |
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| (adverb) into parts or pieces | Synonyms: apart |
| asynergia | (noun) absence of coordination of organs or body parts that usually work together harmoniously | Synonyms: asynergy |
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| asynergic | (adjective) of or relating to the state of asynergy; lacking synergy | - |
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| asynergy | (noun) absence of coordination of organs or body parts that usually work together harmoniously | Synonyms: asynergia |
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| atelier | (noun) a studio especially for an artist or designer | Synonyms: artist's workroom |
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| 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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| atmometer | (noun) an instrument that measures rate of evaporation of water | Synonyms: evaporometer |
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| atmosphere | (noun) a distinctive but intangible quality surrounding a person or thing | Synonyms: air, aura |
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| (noun) the mass of air surrounding the Earth | Synonyms: air |
| (noun) the envelope of gases surrounding any celestial body | - |
| (noun) a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade | Synonyms: atm, standard atmosphere, standard pressure |
| (noun) the weather or climate at some place | Synonyms: atmospheric state |
| (noun) a particular environment or surrounding influence | Synonyms: ambiance, ambience |
| atmospheric | (adjective) relating to or located in the atmosphere | Synonyms: atmospherical |
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| atmospherical | (adjective) relating to or located in the atmosphere | Synonyms: atmospheric |
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| atmospherics | (noun) a crackling or hissing noise caused by electrical interference | Synonyms: atmospheric static, static |
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| atomiser | (noun) a dispenser that turns a liquid (such as perfume) into a fine mist | Synonyms: atomizer, nebuliser, nebulizer, spray, sprayer |
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| atomizer | (noun) a dispenser that turns a liquid (such as perfume) into a fine mist | Synonyms: atomiser, nebuliser, nebulizer, spray, sprayer |
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| attacker | (noun) someone who attacks | Synonyms: aggressor, assailant, assaulter |
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| attainder | (noun) cancellation of civil rights | Synonyms: civil death |
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