| 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 | - |
| 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 |
| 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 |
| 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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| asserter | (noun) someone who claims to speak the truth | Synonyms: affirmer, asseverator, avower, declarer |
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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 |
| assertiveness | (noun) aggressive self-assurance; given to making bold assertions | Synonyms: self-assertiveness |
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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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| 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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| 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 | - |
| asteroid | (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) | - |
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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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| asynergia | (noun) absence of coordination of organs or body parts that usually work together harmoniously | Synonyms: asynergy |
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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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| 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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| 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 |
| 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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| attempter | (noun) one who tries | Synonyms: essayer, trier |
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| attender | (noun) someone who waits on or tends to or attends to the needs of another | Synonyms: attendant, tender |
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| (noun) a person who is present and participates in a meeting | Synonyms: attendant, attendee, meeter |
| (noun) someone who listens attentively | Synonyms: auditor, hearer, listener |
| attester | (noun) someone who affirms or vouches for the correctness or truth or genuineness of something | Synonyms: attestant |
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| attracter | (noun) a characteristic that provides pleasure and attracts | Synonyms: attraction, attractive feature, attractor, magnet |
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| (noun) (physics) a point in the ideal multidimensional phase space that is used to describe a system toward which the system tends to evolve regardless of the starting conditions of the system | Synonyms: attractor |
| (noun) an entertainer who attracts large audiences | Synonyms: attraction, attractor, draw, drawing card |
| auberge | (noun) a hotel providing overnight lodging for travelers | Synonyms: hostel, hostelry, inn, lodge |
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| aubergine | (noun) egg-shaped vegetable having a shiny skin typically dark purple but occasionally white or yellow | Synonyms: eggplant, mad apple |
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| (noun) hairy upright herb native to southeastern Asia but widely cultivated for its large glossy edible fruit commonly used as a vegetable | Synonyms: brinjal, eggplant, eggplant bush, garden egg, mad apple, Solanum melongena |
| auctioneer | (noun) an agent who conducts an auction | - |
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| audiometer | (noun) an instrument used to measure the sensitivity of hearing | Synonyms: sonometer |
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| auger | (noun) hand tool for boring holes | Synonyms: gimlet, screw auger, wimble |
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| (noun) a long flexible steel coil for dislodging stoppages in curved pipes | Synonyms: plumber's snake, snake |
| austereness | (noun) extreme plainness | Synonyms: severeness, severity |
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| austerity | (noun) the trait of great self-denial (especially refraining from worldly pleasures) | Synonyms: asceticism, nonindulgence |
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| authoriser | (noun) an authority who authorizes (people or actions) | Synonyms: authorizer |
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| authorizer | (noun) an authority who authorizes (people or actions) | Synonyms: authoriser |
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| autobiographer | (noun) someone who writes their own biography | - |
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| autoeroticism | (noun) using your own body as a sexual object | Synonyms: autoerotism |
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| autoerotism | (noun) using your own body as a sexual object | Synonyms: autoeroticism |
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| autoloader | (noun) a firearm that reloads itself | Synonyms: self-loader |
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| automaker | (noun) a business engaged in the manufacture of automobiles | Synonyms: auto maker, auto manufacturer, car maker, car manufacturer, carmaker |
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| autostereotype | (noun) the standardized mental picture held in common by members of a cultural group depicting an oversimplified image of themselves and their behaviour. | - |
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| avenger | (noun) someone who takes vengeance | Synonyms: retaliator |
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| average | (noun) a statistic describing the location of a distribution | Synonyms: norm |
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| (noun) an intermediate scale value regarded as normal or usual | - |
| (noun) (sports) the ratio of successful performances to opportunities | - |
| averageness | (noun) ordinariness as a consequence of being average and not outstanding | Synonyms: mediocrity |
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| (noun) the state of being that is average; indicates normality but with connotations of mediocrity | - |
| averment | (noun) a declaration that is made emphatically (as if no supporting evidence were necessary) | Synonyms: assertion, asseveration |
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| aversion | (noun) the act of turning yourself (or your gaze) away | Synonyms: averting |
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| (noun) a feeling of intense dislike | Synonyms: antipathy, distaste |
| averting | (noun) the act of preventing something from occurring | - |
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| (noun) the act of turning yourself (or your gaze) away | Synonyms: aversion |
| avower | (noun) someone who admits or acknowledges openly and boldly | - |
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| (noun) someone who claims to speak the truth | Synonyms: affirmer, asserter, asseverator, declarer |
| 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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| azederach | (noun) tree of northern India and China having purple blossoms and small inedible yellow fruits; naturalized in the southern United States as a shade tree | Synonyms: azedarach, China tree, chinaberry, chinaberry tree, Melia azedarach, Melia azederach, Persian lilac, pride-of-India |
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| babbler | (noun) any of various insectivorous Old World birds with a loud incessant song; in some classifications considered members of the family Muscicapidae | Synonyms: cackler |
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| (noun) an obnoxious and foolish and loquacious talker | Synonyms: chatterbox, chatterer, magpie, prater, spouter |
| babyminder | (noun) a person who looks after babies (usually in the person's own home) while the babys' parents are working | Synonyms: baby minder, minder |
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| babysitter | (noun) a person engaged to care for children when the parents are not home | Synonyms: baby-sitter, sitter |
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| backbencher | (noun) a member of the House of Commons who is not a party leader | - |
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| backbiter | (noun) one who attacks the reputation of another by slander or libel | Synonyms: defamer, libeler, maligner, slanderer, traducer, vilifier |
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| backer | (noun) someone who provides financial support for some venture | Synonyms: angel |
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| backgrounder | (noun) a press conference or interview in which a government official explains to reporters the background of an action or policy | - |
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| backhander | (noun) a backhanded blow | - |
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| backpacker | (noun) a hiker who wears a backpack | Synonyms: packer |
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| backscratcher | (noun) a long-handled scratcher for scratching your back | - |
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| (noun) someone who is willing to trade favors or services for mutual advantage | - |
| backslapper | (noun) someone who demonstrates enthusiastic or excessive cordiality | - |
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| backslider | (noun) someone who lapses into previous undesirable patterns of behavior | Synonyms: recidivist, reversionist |
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| backspacer | (noun) the typewriter key used for back spacing | Synonyms: backspace, backspace key |
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| backstroker | (noun) someone who swims the backstroke | - |
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| backswimmer | (noun) predaceous aquatic insect that swims on its back and may inflict painful bites | Synonyms: Notonecta undulata |
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| backwater | (noun) a place or condition in which no development or progress is occurring | - |
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| (noun) a body of water that was created by a flood or tide or by being held or forced back by a dam | - |
| bacteremia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteriaemia, bacteriemia |
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| bacteria | (noun) (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants | Synonyms: bacterium |
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| bacteriacide | (noun) any chemical agent that destroys bacteria | Synonyms: bactericide |
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| bacteriaemia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteremia, bacteriemia |
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| bactericide | (noun) any drug that destroys bacteria or inhibits their growth | Synonyms: antibacterial, antibacterial drug |
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| (noun) any chemical agent that destroys bacteria | Synonyms: bacteriacide |
| bacteriemia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteremia, bacteriaemia |
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| bacteriochlorophyll | (noun) a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants | - |
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| bacteriologist | (noun) a biologist who studies bacteria | - |
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| bacteriology | (noun) the branch of medical science that studies bacteria in relation to disease | - |
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| bacteriolysis | (noun) dissolution or destruction of bacteria | - |
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| bacteriophage | (noun) a virus that is parasitic (reproduces itself) in bacteria | Synonyms: phage |
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| bacteriostasis | (noun) inhibition of the growth of bacteria | - |
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| bacteriostat | (noun) a chemical or biological material that inhibits bacterial growth | - |
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