| abarticulation | (noun) dislocation of a joint | - |
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| aborticide | (noun) the act of destroying a fetus | Synonyms: feticide |
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| (noun) a drug (or other chemical agent) that causes abortion | Synonyms: abortifacient, abortion-inducing drug |
| acatalectic | (noun) (prosody) a line of verse that has the full number of syllables | - |
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| achromaticity | (noun) the visual property of being without chromatic color | Synonyms: achromatism, colorlessness, colourlessness |
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| acoustic | (noun) a remedy for hearing loss or deafness | - |
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| acoustician | (noun) a physicist who specializes in acoustics | - |
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| acousticophobia | (noun) a morbid fear of sounds including your own voice | Synonyms: phonophobia |
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| acoustics | (noun) the study of the physical properties of sound | - |
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| acrobatics | (noun) the gymnastic moves of an acrobat | Synonyms: tumbling |
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| (noun) the performance of stunts while in flight in an aircraft | Synonyms: aerobatics, stunt flying, stunting |
| acrostic | (noun) a puzzle where you fill a square grid with words reading the same down as across | Synonyms: word square |
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| (noun) verse in which certain letters such as the first in each line form a word or message | - |
| adiabaticity | (noun) The condition of occurring without gain or loss of heat (and thus with no change in entropy, in the quasistatic approximation). | - |
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| adrenocorticotrophin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotropic hormone, adrenocorticotropin, corticotrophin, corticotropin |
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| adrenocorticotropin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, corticotrophin, corticotropin |
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| aerobatics | (noun) the performance of stunts while in flight in an aircraft | Synonyms: acrobatics, stunt flying, stunting |
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| aeronautics | (noun) the theory and practice of navigation through air or space | Synonyms: astronautics |
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| aesthetic | (noun) (philosophy) a philosophical theory as to what is beautiful | Synonyms: esthetic |
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| aesthetician | (noun) a philosopher who specializes in the nature of beauty | Synonyms: esthetician |
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| (noun) a worker skilled in giving beauty treatments (manicures and facials etc.) | Synonyms: esthetician |
| aesthetics | (noun) (art) the branch of philosophy dealing with beauty and taste (emphasizing the evaluative criteria that are applied to art) | Synonyms: esthetics |
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| agnostic | (noun) a person who claims that they cannot have true knowledge about the existence of God (but does not deny that God might exist) | - |
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| (noun) someone who is doubtful or noncommittal about something | Synonyms: doubter |
| agnosticism | (noun) the disbelief in any claims of ultimate knowledge | Synonyms: scepticism, skepticism |
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| (noun) a religious orientation of doubt; a denial of ultimate knowledge of the existence of God | - |
| anaesthetic | (noun) a drug that causes temporary loss of bodily sensations | Synonyms: anaesthetic agent, anesthetic, anesthetic agent |
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| analeptic | (noun) a medication used as a stimulant to the central nervous system | - |
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| analphabetic | (noun) an illiterate person who does not know the alphabet | Synonyms: analphabet |
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| analyticity | (noun) the property of being analytic | - |
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| anesthetic | (noun) a drug that causes temporary loss of bodily sensations | Synonyms: anaesthetic, anaesthetic agent, anesthetic agent |
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| anorectic | (noun) a person suffering from anorexia nervosa | Synonyms: anorexic |
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| anthelmintic | (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelminthic, helminthic, vermifuge |
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| antibiotic | (noun) a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections | Synonyms: antibiotic drug |
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| antic | (noun) a ludicrous or grotesque act done for fun and amusement | Synonyms: caper, joke, prank, put-on, trick |
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| anticatalyst | (noun) (chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst | - |
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| anticholinergic | (noun) a substance that opposes or blocks the action of acetylcholine | Synonyms: anticholinergic drug |
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| anticholinesterase | (noun) a medicine that inhibits cholinesterase by combining with it and so has a cholinergic effect | - |
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| anticipant | (noun) one who anticipates | Synonyms: anticipator |
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| anticipation | (noun) the act of predicting (as by reasoning about the future) | Synonyms: prediction, prevision |
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| (noun) something expected (as on the basis of a norm) | Synonyms: expectancy |
| (noun) an expectation | Synonyms: expectancy |
| (noun) anticipating with confidence of fulfillment | Synonyms: expectation |
| anticipator | (noun) one who anticipates | Synonyms: anticipant |
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| anticlimax | (noun) a change from a serious subject to a disappointing one | Synonyms: bathos |
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| (noun) a disappointing decline after a previous rise | - |
| anticoagulant | (noun) medicine that prevents or retards the clotting of blood | Synonyms: anticoagulant medication, decoagulant |
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| anticoagulation | (noun) the administration of an anticoagulant drug to retard coagulation of the blood | - |
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| anticonvulsant | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant drug, antiepileptic, antiepileptic drug |
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| anticyclone | (noun) (meteorology) winds spiraling outward from a high pressure center; circling clockwise in the Northern Hemisphere and counterclockwise in the southern | - |
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| antidiabetic | (noun) a drug used to treat diabetes mellitus | Synonyms: antidiabetic drug |
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| antidiuretic | (noun) a drug that limits the formation of urine | Synonyms: antidiuretic drug |
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| antiemetic | (noun) a drug that prevents or alleviates nausea and vomiting | Synonyms: antiemetic drug |
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| antiepileptic | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant, anticonvulsant drug, antiepileptic drug |
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| antimycotic | (noun) any agent that destroys or prevents the growth of fungi | Synonyms: antifungal, antifungal agent, antimycotic agent, fungicide |
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| antineoplastic | (noun) any of several drugs that control or kill neoplastic cells; used in chemotherapy to kill cancer cells; all have unpleasant side effects that may include nausea and vomiting and hair loss and suppression of bone marrow function | Synonyms: antineoplastic drug, cancer drug |
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| antiparticle | (noun) a particle that has the same mass as another particle but has opposite values for its other properties; interaction of a particle and its antiparticle results in annihilation and the production of radiant energy | - |
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| antipruritic | (noun) a substance that relieves or prevents itching | - |
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| antipsychotic | (noun) tranquilizer used to treat psychotic conditions when a calming effect is desired | Synonyms: antipsychotic agent, antipsychotic drug, major tranquilizer, major tranquilliser, major tranquillizer, neuroleptic, neuroleptic agent, neuroleptic drug |
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| antipyretic | (noun) any medicine that lowers body temperature to prevent or alleviate fever | Synonyms: febrifuge |
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| antiseptic | (noun) a substance that destroys micro-organisms that carry disease without harming body tissues | - |
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| antisyphilitic | (noun) a drug (or other chemical agent) that is effective against syphilis | - |
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| anxiolytic | (noun) a tranquilizer used to relieve anxiety and reduce tension and irritability | Synonyms: antianxiety drug, anxiolytic drug, minor tranquilizer, minor tranquilliser, minor tranquillizer |
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| apoliticism | (noun) Apathy and/or antipathy towards all political affiliations. | - |
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| apologetics | (noun) the branch of theology that is concerned with the defense of Christian doctrines | - |
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| apprentice | (noun) works for an expert to learn a trade | Synonyms: learner, prentice |
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| apprenticeship | (noun) the position of apprentice | - |
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| aquatic | (noun) a plant that lives in or on water | - |
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| aquatics | (noun) sports that involve bodies of water | Synonyms: water sport |
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| arctic | (noun) a waterproof overshoe that protects shoes from water or snow | Synonyms: galosh, golosh, gumshoe, rubber |
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| arithmetic | (noun) the branch of pure mathematics dealing with the theory of numerical calculations | - |
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| arithmetician | (noun) someone who specializes in arithmetic | - |
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| armistice | (noun) a state of peace agreed to between opponents so they can discuss peace terms | Synonyms: cease-fire, truce |
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| aromaticity | (noun) The property of having an aroma. | - |
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| arthritic | (noun) a person afflicted with arthritis | - |
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| artichoke | (noun) a thistlelike flower head with edible fleshy leaves and heart | Synonyms: globe artichoke |
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| (noun) Mediterranean thistlelike plant widely cultivated for its large edible flower head | Synonyms: artichoke plant, Cynara scolymus, globe artichoke |
| article | (noun) one of a class of artifacts | - |
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| (noun) nonfictional prose forming an independent part of a publication | - |
| (noun) (grammar) a determiner that may indicate the specificity of reference of a noun phrase | - |
| (noun) a separate section of a legal document (as a statute or contract or will) | Synonyms: clause |
| articulateness | (noun) the quality of being facile in speech and writing | Synonyms: fluency, volubility |
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| articulatio | (noun) (anatomy) the point of connection between two bones or elements of a skeleton (especially if it allows motion) | Synonyms: articulation, joint |
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| articulation | (noun) the act of joining things in such a way that motion is possible | - |
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| (noun) (anatomy) the point of connection between two bones or elements of a skeleton (especially if it allows motion) | Synonyms: articulatio, joint |
| (noun) the aspect of pronunciation that involves bringing articulatory organs together so as to shape the sounds of speech | - |
| (noun) expressing in coherent verbal form | Synonyms: voice |
| (noun) the shape or manner in which things come together and a connection is made | Synonyms: join, joint, junction, juncture |
| articulator | (noun) a movable speech organ | - |
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| (noun) someone who pronounces words | - |
| ascetic | (noun) someone who practices self denial as a spiritual discipline | Synonyms: abstainer |
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| asceticism | (noun) rigorous self-denial and active self-restraint | Synonyms: ascesis |
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| (noun) the trait of great self-denial (especially refraining from worldly pleasures) | Synonyms: austerity, nonindulgence |
| (noun) the doctrine that through renunciation of worldly pleasures it is possible to achieve a high spiritual or intellectual state | - |
| asthmatic | (noun) a person suffering from asthma | - |
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| astronautics | (noun) the theory and practice of navigation through air or space | Synonyms: aeronautics |
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| ataractic | (noun) a drug used to reduce stress or tension without reducing mental clarity | Synonyms: antianxiety agent, ataractic agent, ataractic drug, tranquilizer, tranquilliser, tranquillizer |
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| 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 |
| attic | (noun) floor consisting of open space at the top of a house just below roof; often used for storage | Synonyms: garret, loft |
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| (noun) (architecture) a low wall at the top of the entablature; hides the roof | - |
| (noun) informal terms for a human head | Synonyms: bean, bonce, dome, noggin, noodle |
| 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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| autoeroticism | (noun) using your own body as a sexual object | Synonyms: autoerotism |
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| automatic | (noun) self-loading rifle capable of automatic fire | Synonyms: automatic rifle, machine rifle |
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| (noun) a pistol that will keep firing until the ammunition is gone or the trigger is released | Synonyms: automatic pistol |
| ballistics | (noun) the science of flight dynamics | - |
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| (noun) the trajectory of an object in free flight | Synonyms: ballistic trajectory |
| beautician | (noun) someone who works in a beauty parlor | Synonyms: cosmetician |
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| bibliotics | (noun) the scientific study of documents and handwriting etc. especially to determine authorship or authenticity | - |
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| billystick | (noun) a short stout club used primarily by policemen | Synonyms: baton, billy, billy club, nightstick, truncheon |
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| biostatistics | (noun) a branch of biology that studies biological phenomena and observations by means of statistical analysis | Synonyms: biometrics, biometry |
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| biosystematics | (noun) use of data (e.g. cytogenetic or biochemical) to assess taxonomic relations especially within an evolutionary framework | Synonyms: biosystematy |
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| biquadratic | (noun) a polynomial of the fourth degree | Synonyms: biquadratic polynomial, quartic polynomial |
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| (noun) an equation of the fourth degree | Synonyms: biquadratic equation |
| (noun) an algebraic equation or function of the fourth degree | Synonyms: biquadrate, fourth power, quartic |
| bitumastic | (noun) a protective coating of asphalt and filter used on structural metals that are exposed to weathering | - |
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| bluetick | (noun) a very fast American hound; white mottled with bluish grey | - |
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| brattice | (noun) a partition (often temporary) of planks or cloth that is used to control ventilation in a mine | - |
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| breadstick | (noun) a crisp stick-shaped roll; often served with soup | Synonyms: bread-stick |
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| broomstick | (noun) the handle of a broom | Synonyms: broom handle |
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| candlestick | (noun) a holder with sockets for candles | Synonyms: candle holder |
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| canticle | (noun) a hymn derived from the Bible | - |
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| catacaustic | (noun) a caustic curve formed by light reflecting from a curved surface. | - |
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| catalectic | (noun) (prosody) a line of verse that lacks a syllable in the last metrical foot | - |
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