| apothecary | (noun) a health professional trained in the art of preparing and dispensing drugs | Synonyms: chemist, druggist, pharmacist, pill pusher, pill roller |
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| apothecium | (noun) a cuplike ascocarp in many lichens and ascomycetous fungi | - |
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| australopithecine | (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
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| bibliothec | (noun) a professional person trained in library science and engaged in library services | Synonyms: librarian |
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| bibliotheca | (noun) a collection of books | - |
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| check | (noun) the act of restraining power or action or limiting excess | Synonyms: bridle, curb |
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| (noun) obstructing an opponent in ice hockey | - |
| (noun) (chess) a direct attack on an opponent's king | - |
| (noun) the act of inspecting or verifying | Synonyms: check-out procedure, checkout |
| (noun) a textile pattern of squares or crossed lines (resembling a checkerboard) | - |
| (noun) a mark left after a small piece has been chopped or broken off of something | Synonyms: chip |
| (noun) an appraisal of the state of affairs | Synonyms: assay |
| (noun) additional proof that something that was believed (some fact or hypothesis or theory) is correct | Synonyms: confirmation, substantiation, verification |
| (noun) something immaterial that interferes with or delays action or progress | Synonyms: balk, baulk, deterrent, handicap, hinderance, hindrance, impediment |
| (noun) the bill in a restaurant | Synonyms: chit, tab |
| (noun) a mark indicating that something has been noted or completed etc. | Synonyms: check mark, tick |
| (noun) a written order directing a bank to pay money | Synonyms: bank check, cheque |
| (noun) the state of inactivity following an interruption | Synonyms: arrest, halt, hitch, stay, stop, stoppage |
| checkbook | (noun) a book issued to holders of checking accounts | Synonyms: chequebook |
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| checker | (noun) one of the flat round pieces used in playing the game of checkers | Synonyms: chequer |
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| (noun) one who checks the correctness of something | - |
| (noun) an attendant who checks coats or baggage | - |
| checkerberry | (noun) spicy red berrylike fruit; source of wintergreen oil | Synonyms: boxberry, spiceberry, teaberry, wintergreen |
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| (noun) creeping shrub of eastern North America having white bell-shaped flowers followed by spicy red berrylike fruit and shiny aromatic leaves that yield wintergreen oil | Synonyms: creeping wintergreen, Gaultheria procumbens, ground-berry, groundberry, mountain tea, teaberry, wintergreen |
| checkerbloom | (noun) perennial purple-flowered wild mallow of western North America that is also cultivated | Synonyms: Sidalcea malviflora, wild hollyhock |
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| checkerboard | (noun) a board having 64 squares of two alternating colors | Synonyms: checker board, chequerboard |
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| checkers | (noun) a checkerboard game for two players who each have 12 pieces; the object is to jump over and so capture the opponent's pieces | Synonyms: draughts |
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| checklist | (noun) a list of items (names or tasks etc.) to be checked or consulted | - |
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| checkmate | (noun) a chess move constituting an inescapable and indefensible attack on the opponent's king | Synonyms: mate |
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| (noun) complete victory | - |
| checkout | (noun) the act of inspecting or verifying | Synonyms: check-out procedure, check |
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| (noun) a counter in a supermarket where you pay for your purchases | Synonyms: checkout counter |
| (noun) the latest time for vacating a hotel room | Synonyms: checkout time |
| checkpoint | (noun) a place (as at a frontier) where travellers are stopped for inspection and clearance | - |
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| checkrein | (noun) a rein designed to keep the horse's head in the desired position | Synonyms: bearing rein |
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| checkroom | (noun) a room where baggage or parcels are checked | Synonyms: left-luggage office |
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| checksum | (noun) a digit representing the sum of the digits in an instance of digital data; used to check whether errors have occurred in transmission or storage | - |
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| checkup | (noun) a thorough physical examination; includes a variety of tests depending on the age and sex and health of the person | Synonyms: health check, medical, medical checkup, medical exam, medical examination |
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| cleistothecium | (noun) closed spore-bearing structure of some fungi (especially Aspergillaceae and Erysiphaceae) from which spores are released only by decay or disintegration | Synonyms: cleistocarp |
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| countercheck | (noun) something that checks the correctness of a previous check | Synonyms: double check |
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| (noun) a check that restrains another check | - |
| crosscheck | (noun) an illegal check (chopping at an opponent's arms or stick) | - |
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| (noun) an instance of confirming something by considering information from several sources | - |
| dryopithecine | (noun) considered a possible ancestor to both anthropoid apes and humans | - |
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| hecatomb | (noun) a great sacrifice; an ancient Greek or Roman sacrifice of 100 oxen | - |
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| heckelphone | (noun) an oboe pitched an octave below the ordinary oboe | Synonyms: basset oboe |
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| heckle | (noun) a comb for separating flax fibers | Synonyms: hatchel |
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| heckler | (noun) someone who tries to embarrass you with gibes and questions and objections | Synonyms: badgerer |
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| heckling | (noun) shouting to interrupt a speech with which you disagree | Synonyms: barracking |
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| hectare | (noun) (abbreviated `ha') a unit of surface area equal to 100 ares (or 10,000 square meters) | - |
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| hectogram | (noun) 100 grams | Synonyms: hg |
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| hectograph | (noun) duplicator consisting of a gelatin plate from which ink can be taken to make a copy | Synonyms: heliotype |
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| hectoliter | (noun) a metric unit of volume or capacity equal to 100 liters | Synonyms: hectolitre, hl |
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| hectolitre | (noun) a metric unit of volume or capacity equal to 100 liters | Synonyms: hectoliter, hl |
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| hectometer | (noun) a metric unit of length equal to 100 meters | Synonyms: hectometre, hm |
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| hectometre | (noun) a metric unit of length equal to 100 meters | Synonyms: hectometer, hm |
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| homothecy | (noun) (mathematics) an isotropic scaling transformation of an affine space with a single fixed point. | Synonyms: homothety |
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| paycheck | (noun) a check issued in payment of wages or salary | Synonyms: payroll check |
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| perithecium | (noun) flask-shaped ascocarp | - |
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| prophecy | (noun) knowledge of the future (usually said to be obtained from a divine source) | Synonyms: prognostication, vaticination |
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| (noun) a prediction uttered under divine inspiration | Synonyms: divination |
| rudapithecus | (noun) fossil hominoids from northern central Hungary; late Miocene | Synonyms: Dryopithecus Rudapithecus hungaricus |
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| sphecoid | (noun) any of various solitary wasps | Synonyms: sphecoid wasp |
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| sympathectomy | (noun) surgical interruption of a nerve pathway in the sympathetic nervous system | - |
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| theca | (noun) outer sheath of the pupa of certain insects | - |
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| (noun) a case or sheath especially a pollen sac or moss capsule | Synonyms: sac |
| thecodont | (noun) presumably in the common ancestral line to dinosaurs and crocodiles and birds | Synonyms: thecodont reptile |
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