| attemper | (verb) modify the temperature of | - |
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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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| (verb) sell at an auction | Synonyms: auction, auction off |
| 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 |
| auriferous | (adjective) containing gold | Synonyms: gold-bearing |
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| austere | (adjective) practicing great self-denial | Synonyms: ascetic, ascetical, spartan |
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| (adjective) of a stern or strict bearing or demeanor; forbidding in aspect | Synonyms: stern |
| (adjective) severely simple | Synonyms: severe, stark, stern |
| austerely | (adverb) in an austere fashion | - |
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| 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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| autoerotic | (adjective) sexually satisfying yourself (as by masturbation) | - |
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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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| aver | (verb) to declare or affirm solemnly and formally as true | Synonyms: affirm, assert, avow, swan, swear, verify |
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| (verb) report or maintain | Synonyms: allege, say |
| average | (adjective) lacking special distinction, rank, or status; commonly encountered | Synonyms: ordinary |
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| (adjective) around the middle of a scale of evaluation | Synonyms: intermediate, medium |
| (adjective) lacking exceptional quality or ability | Synonyms: fair, mediocre, middling |
| (adjective) relating to or constituting the middle value of an ordered set of values (or the average of the middle two in a set with an even number of values) | Synonyms: median |
| (adjective) approximating the statistical norm or average or expected value | Synonyms: mean |
| (adjective) relating to or constituting the most frequent value in a distribution | Synonyms: modal |
| (noun) a statistic describing the location of a distribution | Synonyms: norm |
| (noun) an intermediate scale value regarded as normal or usual | - |
| (noun) (sports) the ratio of successful performances to opportunities | - |
| (verb) compute the average of | Synonyms: average out |
| (verb) achieve or reach on average | - |
| (verb) amount to or come to an average, without loss or gain | Synonyms: average out |
| 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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| averse | (adjective) (usually followed by `to') strongly opposed | Synonyms: antipathetic, antipathetical, indisposed, loath, loth |
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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 |
| aversive | (adjective) tending to repel or dissuade | - |
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| avert | (verb) turn away or aside | Synonyms: turn away |
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| (verb) prevent the occurrence of; prevent from happening; to protect from or to keep away anything undesirable; to ward off | Synonyms: avoid, debar, deflect, fend off, forefend, forfend, head off, obviate, stave off, ward off |
| avertable | (adjective) capable of being avoided or warded off | Synonyms: avertible, avoidable, evitable |
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| avertible | (adjective) capable of being avoided or warded off | Synonyms: avertable, avoidable, evitable |
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| 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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| bacciferous | (adjective) producing or bearing berries | Synonyms: baccate, berried |
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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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| backscatter | (verb) scatter (radiation) by the atoms of the medium through which it passes | - |
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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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| bacteremic | (adjective) of or relating to or having bacteremia | - |
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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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| bacterial | (adjective) relating to or caused by bacteria | - |
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| bacterially | (adverb) by bacteria | - |
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| bactericidal | (adjective) preventing infection by inhibiting the growth or action of microorganisms | Synonyms: disinfectant, germicidal |
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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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| bacterioid | (adjective) resembling bacteria | Synonyms: bacterioidal, bacteroid, bacteroidal |
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| bacterioidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacteroid, bacteroidal |
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| bacteriologic | (adjective) of or relating to bacteriology | Synonyms: bacteriological |
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| bacteriological | (adjective) of or relating to bacteriology | Synonyms: bacteriologic |
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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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| bacteriolytic | (adjective) of or relating to or causing bacteriolysis | - |
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| bacteriophage | (noun) a virus that is parasitic (reproduces itself) in bacteria | Synonyms: phage |
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| bacteriophagic | (adjective) of or relating to bacteriophages | Synonyms: bacteriophagous |
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| bacteriophagous | (adjective) of or relating to bacteriophages | Synonyms: bacteriophagic |
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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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| bacteriostatic | (adjective) of or relating to or causing bacteriostasis | - |
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| bacterise | (verb) subject to the action of bacteria | Synonyms: bacterize |
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| bacterium | (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: bacteria |
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| bacterize | (verb) subject to the action of bacteria | Synonyms: bacterise |
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| bacteroid | (adjective) resembling bacteria | Synonyms: bacterioid, bacterioidal, bacteroidal |
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| (noun) a rodlike bacterium (especially any of the rod-shaped or branched bacteria in the root nodules of nitrogen-fixing plants) | - |
| bacteroidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacterioidal, bacteroid |
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| badger | (noun) sturdy carnivorous burrowing mammal with strong claws; widely distributed in the Northern Hemisphere | - |
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| (verb) persuade through constant efforts | - |
| (verb) annoy persistently | Synonyms: beleaguer, bug, pester, tease |
| badgerer | (noun) someone who tries to embarrass you with gibes and questions and objections | Synonyms: heckler |
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| badgering | (noun) the act of harassing someone | Synonyms: bedevilment, torment, worrying |
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| baedeker | (noun) any of a series of travel guidebooks published by the German firm founded by Karl Baedeker | - |
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| bagger | (noun) a machine for putting objects or substances into bags | - |
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| (noun) a workman employed to pack things into containers | Synonyms: boxer, packer |
| bagpiper | (noun) someone who plays the bagpipe | Synonyms: piper |
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| baker | (noun) someone who bakes bread or cake | Synonyms: bread maker |
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| (noun) someone who bakes commercially | - |
| bakery | (noun) a workplace where baked goods (breads and cakes and pastries) are produced or sold | Synonyms: bakehouse, bakeshop |
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| balancer | (noun) either of the rudimentary hind wings of dipterous insects; used for maintaining equilibrium during flight | Synonyms: halter, haltere |
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| (noun) an acrobat who balances himself in difficult positions | - |
| balderdash | (noun) trivial nonsense | Synonyms: fiddle-faddle, piffle |
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| balker | (noun) a person who refuses to comply | Synonyms: baulker, noncompliant |
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| balladeer | (noun) a singer of popular ballads | Synonyms: crooner |
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| ballerina | (noun) a female ballet dancer | Synonyms: danseuse |
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