| antigram | (noun) an anagram that means the opposite of the original word or phrase | - |
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| antiparallel | (adjective) (especially of vectors) parallel but oppositely directed | - |
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| antiperspirant | (noun) an astringent substance applied to the skin to reduce perspiration | - |
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| antiphrasis | (noun) the use of a word in a sense opposite to its normal sense (especially in irony) | - |
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| antitrade | (noun) winds blowing from west to east and lying above the trade winds in the tropics | Synonyms: antitrade wind |
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| antitrades | (noun) wind in the upper atmosphere blowing above but in the opposite direction from the trade winds | - |
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| antiviral | (adjective) inhibiting or stopping the growth and reproduction of viruses | - |
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| (noun) any drug that destroys viruses | Synonyms: antiviral agent, antiviral drug |
| anuran | (adjective) relating to frogs and toads | Synonyms: batrachian, salientian |
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| (noun) any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species | Synonyms: batrachian, frog, salientian, toad, toad frog |
| apicultural | (adjective) relating to the care and breeding of bees | - |
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| aplacophoran | (noun) deep-water wormlike mollusks lacking calcareous plates on the body but having fine slimy spicules on the covering mantle | Synonyms: solenogaster |
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| apparatchik | (noun) a communist who was a member of the administrative system of a communist party | - |
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| (noun) a humorous but derogatory term for an official of a large organization (especially a political organization) | - |
| apparatus | (noun) equipment designed to serve a specific function | Synonyms: setup |
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| (noun) (anatomy) a group of body parts that work together to perform a given function | - |
| appearance | (noun) the act of appearing in public view | - |
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| (noun) formal attendance (in court or at a hearing) of a party in an action | Synonyms: appearing, coming into court |
| (noun) pretending that something is the case in order to make a good impression | Synonyms: show |
| (noun) outward or visible aspect of a person or thing | Synonyms: visual aspect |
| (noun) a mental representation | - |
| (noun) the event of coming into sight | - |
| appoggiatura | (noun) an embellishing note usually written in smaller size | Synonyms: acciaccatura, grace note |
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| appraisal | (noun) an expert estimation of the quality, quantity, and other characteristics of someone or something | - |
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| (noun) the classification of someone or something with respect to its worth | Synonyms: assessment |
| (noun) a document appraising the value of something (as for insurance or taxation) | Synonyms: estimate, estimation |
| appraise | (verb) consider in a comprehensive way | Synonyms: survey |
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| (verb) evaluate or estimate the nature, quality, ability, extent, or significance of | Synonyms: assess, evaluate, measure, valuate, value |
| appraiser | (noun) one who estimates officially the worth or value or quality of things | Synonyms: valuator |
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| (noun) one who determines authenticity (as of works of art) or who guarantees validity | Synonyms: authenticator |
| appraising | (adjective) exercising or involving careful evaluations | Synonyms: evaluative |
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| apractic | (adjective) having uncoordinated muscular movements, symptomatic of a CNS disorder | Synonyms: apraxic |
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| apraxia | (noun) inability to make purposeful movements | - |
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| apraxic | (adjective) having uncoordinated muscular movements, symptomatic of a CNS disorder | Synonyms: apractic |
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| apteral | (adjective) having columns at one or both ends but not along the sides | - |
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| (adjective) (of insects) without wings | Synonyms: apterous |
| aquacultural | (adjective) of or relating to aquiculture | Synonyms: aquicultural, hydroponic |
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| aquicultural | (adjective) of or relating to aquiculture | Synonyms: aquacultural, hydroponic |
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| arabesque | (noun) an ornament that interlaces simulated foliage in an intricate design | - |
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| (noun) position in which the dancer has one leg raised behind and arms outstretched in a conventional pose | - |
| arability | (noun) the quality of land that is appropriate for cultivation | - |
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| arable | (adjective) (of farmland) capable of being farmed productively | Synonyms: cultivable, cultivatable, tillable |
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| araceous | (adjective) relating to a plant of the family Araceae | Synonyms: aroid |
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| arachnid | (noun) air-breathing arthropods characterized by simple eyes and four pairs of legs | Synonyms: arachnoid |
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| arachnidian | (adjective) relating to or resembling a member of the class Arachnida | Synonyms: arachnoid, spiderlike, spiderly, spidery |
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| arachnoid | (adjective) relating to or resembling a member of the class Arachnida | Synonyms: arachnidian, spiderlike, spiderly, spidery |
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| (noun) air-breathing arthropods characterized by simple eyes and four pairs of legs | Synonyms: arachnid |
| (noun) the middle of the 3 meninges | Synonyms: arachnoid membrane |
| arachnophobia | (noun) a morbid fear of spiders | - |
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| aragonite | (noun) a mineral form of crystalline calcium carbonate; dimorphic with calcite | - |
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| arak | (noun) any of various strong liquors distilled from the fermented sap of toddy palms or from fermented molasses | Synonyms: arrack |
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| aralia | (noun) any of various plants of the genus Aralia; often aromatic plants having compound leaves and small umbellate flowers | - |
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| arame | (noun) an edible seaweed with a mild flavor | - |
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| araneidal | (adjective) relating to or resembling a spider | Synonyms: araneidan |
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| araneidan | (adjective) relating to or resembling a spider | Synonyms: araneidal |
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| arariba | (noun) Brazilian tree with handsomely marked wood | Synonyms: Centrolobium robustum |
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| araroba | (noun) a bitter yellow powder used to treat skin diseases | Synonyms: chrysarobin, Goa powder |
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| araucaria | (noun) any of several tall South American or Australian trees with large cones and edible seeds | - |
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| arbitrable | (adjective) appropriate for or subject to settlement by arbitration | - |
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| arbitrage | (noun) a kind of hedged investment meant to capture slight differences in price; when there is a difference in the price of something on two different markets the arbitrageur simultaneously buys at the lower price and sells at the higher price | - |
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| (verb) practice arbitrage, as in the stock market | - |
| arbitrager | (noun) someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential) | Synonyms: arb, arbitrageur |
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| arbitrageur | (noun) someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential) | Synonyms: arb, arbitrager |
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| arbitral | (adjective) relating to or resulting from arbitration | Synonyms: arbitrational |
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| arbitrament | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitration, arbitrement |
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| arbitrarily | (adverb) in a random manner | Synonyms: at random, every which way, haphazardly, indiscriminately, randomly, willy-nilly |
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| arbitrariness | (noun) the trait of acting unpredictably and more from whim or caprice than from reason or judgment | Synonyms: capriciousness, flightiness, whimsey, whimsicality, whimsy |
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| arbitrary | (adjective) based on or subject to individual discretion or preference or sometimes impulse or caprice | - |
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| arbitrate | (verb) act between parties with a view to reconciling differences | Synonyms: intercede, intermediate, liaise, mediate |
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| arbitration | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitrament, arbitrement |
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| (noun) (law) the hearing and determination of a dispute by an impartial referee agreed to by both parties (often used to settle disputes between labor and management) | - |
| arbitrational | (adjective) relating to or resulting from arbitration | Synonyms: arbitral |
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| arbitrative | (adjective) relating to or having the authority to arbitrate | - |
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| arbitrator | (noun) someone chosen to judge and decide a disputed issue | Synonyms: arbiter, umpire |
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| arboraceous | (adjective) abounding in trees | Synonyms: arboreous, woodsy, woody |
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| arborary | (adjective) of or relating to or formed by trees | Synonyms: arboreal, arborical, arborous |
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| architectural | (adjective) of or pertaining to the art and science of architecture | - |
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| architecturally | (adverb) with regard to architecture | - |
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| architrave | (noun) the lowest part of an entablature; rests immediately on the capitals of the columns | - |
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| (noun) the molding around a door or window | - |
| aristocracy | (noun) a privileged class holding hereditary titles | Synonyms: nobility |
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| (noun) the most powerful members of a society | Synonyms: gentry |
| aristocrat | (noun) a member of the aristocracy | Synonyms: blue blood, patrician |
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| aristocratic | (adjective) belonging to or characteristic of the nobility or aristocracy | Synonyms: aristocratical, blue-blooded, blue, gentle, patrician |
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| aristocratical | (adjective) belonging to or characteristic of the nobility or aristocracy | Synonyms: aristocratic, blue-blooded, blue, gentle, patrician |
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| aristocratically | (adverb) in an aristocratic manner | - |
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| aristocratism | (noun) the principles, practices or characteristics of aristocracy. | - |
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| aromatherapy | (noun) the therapeutic use of aromatic plant extracts and essential oils in baths or massage | - |
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| arrack | (noun) any of various strong liquors distilled from the fermented sap of toddy palms or from fermented molasses | Synonyms: arak |
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| arraign | (verb) accuse of a wrong or an inadequacy | - |
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| (verb) call before a court to answer an indictment | - |
| arraignment | (noun) a legal document calling someone to court to answer an indictment | - |
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| arrange | (verb) arrange attractively | Synonyms: coif, coiffe, coiffure, do, dress, set |
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| (verb) arrange thoughts, ideas, temporal events | Synonyms: order, put, set up |
| (verb) make arrangements for | Synonyms: fix up |
| (verb) put into a proper or systematic order | Synonyms: set up |
| (verb) adapt for performance in a different way | Synonyms: set |
| (verb) set (printed matter) into a specific format | Synonyms: format |
| (verb) plan, organize, and carry out (an event) | Synonyms: stage |
| arranged | (adjective) disposed or placed in a particular kind of order | Synonyms: ordered |
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| (adjective) deliberately arranged for effect | Synonyms: staged |
| (adjective) organized or planned for | - |
| arrangement | (noun) the act of arranging and adapting a piece of music | Synonyms: arranging, transcription |
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| (noun) the spatial property of the way in which something is placed | Synonyms: placement |
| (noun) an organized structure for arranging or classifying | Synonyms: organisation, organization, system |
| (noun) the thing arranged or agreed to | Synonyms: agreement |
| (noun) a piece of music that has been adapted for performance by a particular set of voices or instruments | Synonyms: musical arrangement |
| (noun) an orderly grouping (of things or persons) considered as a unit; the result of arranging | - |
| 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 |
| arranging | (noun) the act of arranging and adapting a piece of music | Synonyms: arrangement, transcription |
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| arrant | (adjective) without qualification; used informally as (often pejorative) intensifiers | Synonyms: complete, consummate, double-dyed, everlasting, gross, perfect, pure, sodding, staring, stark, thorough, thoroughgoing, unadulterated, utter |
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| arras | (noun) a wall hanging of heavy handwoven fabric often with pictorial designs | Synonyms: tapestry |
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| array | (noun) an arrangement of aerials spaced to give desired directional characteristics | - |
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| (noun) especially fine or decorative clothing | Synonyms: raiment, regalia |
| (noun) an impressive display | - |
| (noun) an orderly arrangement | - |
| (verb) align oneself with a group or a way of thinking | Synonyms: align |
| (verb) lay out orderly or logically in a line or as if in a line | Synonyms: lay out, range, set out |
| arrayed | (adjective) in ceremonial attire and paraphernalia | Synonyms: panoplied |
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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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| arthralgia | (noun) pain in a joint or joints | - |
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| arthralgic | (adjective) of or relating to arthralgia | - |
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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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| asarabacca | (noun) thick creeping evergreen herb of western Europe | Synonyms: Asarum europaeum |
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| ashram | (noun) (India) a place of religious retreat for Hindus | - |
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| (noun) a place of religious retreat modeled after the Indian ashram | - |
| ashtray | (noun) a receptacle for the ash from smokers' cigars or cigarettes | - |
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| asparaginase | (noun) antineoplastic drug (trade name Elspar) sometimes used to treat lymphoblastic leukemia | Synonyms: Elspar |
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| asparagine | (noun) a crystalline amino acid found in proteins and in many plants (e.g., asparagus) | - |
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| asparagus | (noun) edible young shoots of the asparagus plant | - |
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| (noun) plant whose succulent young shoots are cooked and eaten as a vegetable | Synonyms: Asparagus officinales, edible asparagus |
| aspidistra | (noun) evergreen perennial with large handsome basal leaves; grown primarily as a foliage houseplant | Synonyms: Aspidistra elatio, bar-room plant, cast-iron plant |
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| aspirant | (adjective) desiring or striving for recognition or advancement | Synonyms: aspiring, wishful |
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| (noun) an ambitious and aspiring young person | Synonyms: aspirer, hopeful, wannabe, wannabee |
| aspirate | (noun) a consonant pronounced with aspiration | - |
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| (noun) a speech sound having as an obvious concomitant an audible puff of breath, as initial stop consonants or initial h -sounds. | - |
| (verb) inhale (air, water, etc.) | - |
| (verb) pronounce with aspiration; of stop sounds | - |
| (verb) remove by suction | Synonyms: draw out, suck out |
| aspiration | (noun) the act of inhaling; the drawing in of air (or other gases) as in breathing | Synonyms: breathing in, inhalation, inspiration, intake |
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| (noun) a will to succeed | - |
| (noun) a manner of articulation involving an audible release of breath | - |
| (noun) a cherished desire | Synonyms: ambition, dream |
| aspirator | (noun) a pump that draws air or another gas through a liquid | - |
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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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| assurance | (noun) freedom from doubt; belief in yourself and your abilities | Synonyms: authority, confidence, self-assurance, self-confidence, sureness |
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| (noun) a statement intended to inspire confidence | - |
| (noun) a binding commitment to do or give or refrain from something | Synonyms: pledge |
| (noun) a British term for some kinds of insurance | - |