| cheiloscopy | (noun) a forensic investigation technique that deals with identification of humans based on lip traces. | - |
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| cheilosis | (noun) a disorder of the lips marked by scaling and fissures at the corners of the mouth; caused by a deficiency of riboflavin | Synonyms: perleche |
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| chemosis | (noun) edema of the mucous membrane of the eyeball and eyelid lining | - |
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| chemosorption | (noun) adsorption (especially when irreversible) by means of chemical instead of physical forces | Synonyms: chemisorption |
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| chemosurgery | (noun) use of chemical to destroy diseased or malignant tissue; used in treatment of skin cancer | - |
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| chemosynthesis | (noun) synthesis of carbohydrate from carbon dioxide and water; limited to certain bacteria and fungi | - |
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| chiaroscuro | (noun) a monochrome picture made by using several different shades of the same color | - |
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| chinos | (noun) (plural) trousers made with chino cloth | - |
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| chlamydospore | (noun) thick-walled asexual resting spore of certain fungi and algae | - |
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| chlorosis | (noun) iron deficiency anemia in young women; characterized by weakness and menstrual disturbances and a green color to the skin | Synonyms: greensickness |
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| chlorpyrifos | (noun) a common organophosphate insecticide | - |
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| chondriosome | (noun) an organelle containing enzymes responsible for producing energy | Synonyms: mitochondrion |
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| chondrosarcoma | (noun) a malignant neoplasm of cartilage cells | - |
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| chooser | (noun) a person who chooses or selects out | Synonyms: picker, selector |
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| chosen | (noun) an exclusive group of people | Synonyms: elect |
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| (noun) one who is the object of choice; who is given preference | - |
| chromoblastomycosis | (noun) a fungal infection characterized by itchy warty nodules on the skin | - |
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| chromosome | (noun) a threadlike strand of DNA in the cell nucleus that carries the genes in a linear order | - |
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| chromosphere | (noun) a gaseous layer of the sun's atmosphere (extending from the photosphere to the corona) that is visible during a total eclipse of the sun | - |
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| chronoscope | (noun) an instrument for accurate measurements of small intervals of time | - |
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| chymosin | (noun) an enzyme that occurs in gastric juice; causes milk to coagulate | Synonyms: rennin |
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| cirrhosis | (noun) a chronic disease interfering with the normal functioning of the liver; the major cause is chronic alcoholism | Synonyms: cirrhosis of the liver |
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| cirrostratus | (noun) a thin uniform layer of hazy cloud at high altitude | Synonyms: cirrostratus cloud |
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| close | (noun) the concluding part of any performance | Synonyms: closing curtain, finale, finis |
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| (noun) the last section of a communication | Synonyms: closing, conclusion, end, ending |
| (noun) the temporal end; the concluding time | Synonyms: conclusion, finale, finis, finish, last, stopping point |
| closedown | (noun) termination of operations | Synonyms: closing, closure, shutdown |
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| closeness | (noun) the spatial property resulting from a relatively small distance | Synonyms: nearness |
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| (noun) characterized by a lack of openness (especially about one's actions or purposes) | Synonyms: secretiveness |
| (noun) the quality of being close and poorly ventilated | Synonyms: stuffiness |
| (noun) close or warm friendship | Synonyms: familiarity, intimacy |
| (noun) extreme stinginess | Synonyms: meanness, minginess, niggardliness, niggardness, parsimoniousness, parsimony, tightfistedness, tightness |
| (noun) a feeling of being intimate and belonging together | Synonyms: intimacy |
| closeout | (noun) a sale intended to dispose of all remaining stock | - |
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| closer | (noun) (baseball) a relief pitcher who can protect a lead in the last inning or two of the game | Synonyms: finisher |
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| (noun) a person who closes something | - |
| closet | (noun) a small private room for study or prayer | - |
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| (noun) a toilet in Britain | Synonyms: loo, W.C., water closet |
| (noun) a tall piece of furniture that provides storage space for clothes; has a door and rails or hooks for hanging clothes | Synonyms: press, wardrobe |
| (noun) a small room (or recess) or cabinet used for storage space | Synonyms: cupboard |
| closeup | (noun) a photograph taken at close range | - |
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| closing | (noun) termination of operations | Synonyms: closedown, closure, shutdown |
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| (noun) the act of closing something | Synonyms: shutting |
| (noun) a concluding action | Synonyms: completion, culmination, mop up, windup |
| (noun) approaching a particular destination; a coming closer; a narrowing of a gap | Synonyms: closure |
| (noun) the last section of a communication | Synonyms: close, conclusion, end, ending |
| clostridia | (noun) spindle-shaped bacterial cell especially one swollen at the center by an endospore | Synonyms: clostridium |
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| clostridium | (noun) spindle-shaped bacterial cell especially one swollen at the center by an endospore | Synonyms: clostridia |
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| closure | (noun) termination of operations | Synonyms: closedown, closing, shutdown |
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| (noun) the act of blocking | Synonyms: blockage, occlusion |
| (noun) approaching a particular destination; a coming closer; a narrowing of a gap | Synonyms: closing |
| (noun) an obstruction in a pipe or tube | Synonyms: block, blockage, occlusion, stop, stoppage |
| (noun) a Gestalt principle of organization holding that there is an innate tendency to perceive incomplete objects as complete and to close or fill gaps and to perceive asymmetric stimuli as symmetric | Synonyms: law of closure |
| (noun) something settled or resolved; the outcome of decision making | Synonyms: resolution, settlement |
| (noun) a rule for limiting or ending debate in a deliberative body | Synonyms: cloture, gag law, gag rule |
| coccidioidomycosis | (noun) an infection of the lungs and skin characterized by excessive sputum and nodules | Synonyms: coccidiomycosis, desert rheumatism, valley fever |
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| coccidiomycosis | (noun) an infection of the lungs and skin characterized by excessive sputum and nodules | Synonyms: coccidioidomycosis, desert rheumatism, valley fever |
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| coccidiosis | (noun) (veterinary medicine) infestation with coccidia | - |
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| cocoswood | (noun) wood of the granadilla tree used for making musical instruments especially clarinets | Synonyms: cocuswood, granadilla wood |
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| coelostat | (noun) optical device used to follow the path of a celestial body and reflect its light into a telescope; has a movable and a fixed mirror | - |
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| cognoscente | (noun) an expert able to appreciate a field; especially in the fine arts | Synonyms: connoisseur |
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| cohosh | (noun) a plant of the genus Actaea having acrid poisonous berries | Synonyms: baneberry, herb Christopher |
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| colonoscope | (noun) an elongated fiberoptic endoscope for examining the entire colon from cecum to rectum | - |
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| colonoscopy | (noun) visual examination of the colon (with a colonoscope) from the cecum to the rectum; requires sedation | - |
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| colossus | (noun) someone that is abnormally large and powerful | Synonyms: behemoth, giant, goliath, monster |
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| (noun) a person of exceptional importance and reputation | Synonyms: behemoth, giant, heavyweight, titan |
| colostomy | (noun) a surgical operation that creates an opening from the colon to the surface of the body to function as an anus | - |
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| colostrum | (noun) milky fluid secreted for the first day or two after parturition | Synonyms: foremilk |
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| colposcope | (noun) An endoscopic instrument that magnifies the epithelia of the vagina and cervix in vivo to allow direct observation and study of these tissues. | Synonyms: vaginoscope |
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| colpoxerosis | (noun) a condition in which the vagina is unusually dry | - |
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| comatoseness | (noun) a state of deep and often prolonged unconsciousness; usually the result of disease or injury | Synonyms: coma |
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| composedness | (noun) The state or quality of showing composure. | - |
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| composer | (noun) someone who composes music, usually as a profession | - |
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| composing | (noun) musical creation | Synonyms: composition |
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| (noun) the spatial property resulting from the arrangement of parts in relation to each other and to the whole | Synonyms: composition |
| composite | (noun) a conceptual whole made up of complicated and related parts | Synonyms: complex |
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| (noun) considered the most highly evolved dicotyledonous plants, characterized by florets arranged in dense heads that resemble single flowers | Synonyms: composite plant |
| compositeness | (noun) the property of being a composite number | - |
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| composition | (noun) the act of creating written works | Synonyms: authorship, penning, writing |
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| (noun) musical creation | Synonyms: composing |
| (noun) something that is created by arranging several things to form a unified whole | - |
| (noun) the way in which someone or something is composed | Synonyms: constitution, make-up, makeup, physical composition |
| (noun) the spatial property resulting from the arrangement of parts in relation to each other and to the whole | Synonyms: composing |
| (noun) an essay (especially one written as an assignment) | Synonyms: paper, report, theme |
| (noun) a musical work that has been created | Synonyms: musical composition, opus, piece, piece of music |
| (noun) art and technique of printing with movable type | Synonyms: typography |
| (noun) a mixture of ingredients | - |
| compositor | (noun) one who sets written material into type | Synonyms: setter, typesetter, typographer |
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| compost | (noun) a mixture of decaying vegetation and manure; used as a fertilizer | - |
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| composure | (noun) steadiness of mind under stress | Synonyms: calm, calmness, equanimity |
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| conenose | (noun) large bloodsucking bug | Synonyms: big bedbug, cone-nosed bug, conenose bug, kissing bug |
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| conidiospore | (noun) an asexually produced fungal spore formed on a conidiophore | Synonyms: conidium |
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| corposant | (noun) an electrical discharge accompanied by ionization of surrounding atmosphere | Synonyms: corona, corona discharge, electric glow, Saint Elmo's fire, Saint Elmo's light, Saint Ulmo's fire, Saint Ulmo's light, St. Elmo's fire |
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| corrosion | (noun) erosion by chemical action | Synonyms: corroding, erosion |
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| (noun) a state of deterioration in metals caused by oxidation or chemical action | - |
| corrosive | (noun) a substance having the tendency to cause corrosion (such a strong acids or alkali) | - |
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| corticosteroid | (noun) a steroid hormone produced by the adrenal cortex or synthesized; administered as drugs they reduce swelling and decrease the body's immune response | Synonyms: adrenal cortical steroid, corticoid |
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| corticosterone | (noun) secreted by the adrenal cortex; involved in regulating water and electrolyte balance in the body | - |
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| corythosaur | (noun) duck-billed dinosaur with nasal passages that expand into a crest like a hollow helmet | Synonyms: corythosaurus |
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| corythosaurus | (noun) duck-billed dinosaur with nasal passages that expand into a crest like a hollow helmet | Synonyms: corythosaur |
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| cos | (noun) lettuce with long dark-green leaves in a loosely packed elongated head | Synonyms: cos lettuce, romaine, romaine lettuce |
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| (noun) ratio of the adjacent side to the hypotenuse of a right-angled triangle | Synonyms: cosine |
| coscoroba | (noun) large white South American bird intermediate in some respects between ducks and swans | - |
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| cosec | (noun) ratio of the hypotenuse to the opposite side of a right-angled triangle | Synonyms: cosecant |
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| cosecant | (noun) ratio of the hypotenuse to the opposite side of a right-angled triangle | Synonyms: cosec |
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| cosh | (noun) a piece of metal covered by leather with a flexible handle; used for hitting people | Synonyms: blackjack, sap |
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| cosignatory | (noun) one of two or more signers of the same document (as a treaty or declaration) | Synonyms: cosigner |
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| cosigner | (noun) one of two or more signers of the same document (as a treaty or declaration) | Synonyms: cosignatory |
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| (noun) a signer in addition to the principal signer (to verify the authenticity of the principal signature or to provide surety) | - |
| cosine | (noun) ratio of the adjacent side to the hypotenuse of a right-angled triangle | Synonyms: cos |
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| cosiness | (noun) a state of warm snug comfort | Synonyms: coziness, snugness |
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| cosmea | (noun) any of various mostly Mexican herbs of the genus Cosmos having radiate heads of variously colored flowers and pinnate leaves; popular fall-blooming annuals | Synonyms: cosmos |
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| cosmetic | (noun) a toiletry designed to beautify the body | - |
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| cosmetician | (noun) someone who sells or applies cosmetics | - |
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| (noun) someone who works in a beauty parlor | Synonyms: beautician |
| cosmetologist | (noun) an expert in the use of cosmetics | - |
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| cosmetology | (noun) the practice of beautifying the face and hair and skin | - |
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| cosmid | (noun) (genetics) a large vector that is made from a bacteriophage and used to clone genes or gene fragments | - |
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| cosmogeny | (noun) the branch of astrophysics that studies the origin and evolution and structure of the universe | Synonyms: cosmogony, cosmology |
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| cosmogony | (noun) the branch of astrophysics that studies the origin and evolution and structure of the universe | Synonyms: cosmogeny, cosmology |
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| cosmographer | (noun) a scientist knowledgeable about cosmography | Synonyms: cosmographist |
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| cosmographist | (noun) a scientist knowledgeable about cosmography | Synonyms: cosmographer |
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| cosmography | (noun) a representation of the earth or the heavens | - |
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| (noun) the science that maps the general features of the universe; describes both heaven and earth (but without encroaching on geography or astronomy) | - |
| cosmolatry | (noun) the worship of the cosmos | - |
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| cosmologist | (noun) an astronomer who studies the evolution and space-time relations of the universe | - |
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| cosmology | (noun) the branch of astrophysics that studies the origin and evolution and structure of the universe | Synonyms: cosmogeny, cosmogony |
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| (noun) the metaphysical study of the origin and nature of the universe | - |
| cosmonaut | (noun) a person trained to travel in a spacecraft | Synonyms: astronaut, spaceman |
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| cosmopolitan | (noun) a sophisticated person who has travelled in many countries | Synonyms: cosmopolite |
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| cosmopolitanity | (noun) a state or quality of being cosmopolitan | - |
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| cosmopolite | (noun) a sophisticated person who has travelled in many countries | Synonyms: cosmopolitan |
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| cosmos | (noun) everything that exists anywhere | Synonyms: creation, existence, macrocosm, universe, world |
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| (noun) any of various mostly Mexican herbs of the genus Cosmos having radiate heads of variously colored flowers and pinnate leaves; popular fall-blooming annuals | Synonyms: cosmea |
| cosmotron | (noun) a large proton synchrotron; uses frequency modulation of an electric field to accelerate protons | - |
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| cosplayer | (noun) Someone who wears a costume from a comic book or similar media | - |
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| coss | (noun) (in India) a unit of length having different values in different localities | Synonyms: kos |
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| cost | (noun) the property of having material worth (often indicated by the amount of money something would bring if sold) | Synonyms: monetary value, price |
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| (noun) value measured by what must be given or done or undergone to obtain something | Synonyms: price, toll |
| (noun) the total spent for goods or services including money and time and labor | - |
| costa | (noun) any of the 12 pairs of curved arches of bone extending from the spine to or toward the sternum in humans (and similar bones in most vertebrates) | Synonyms: rib |
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| (noun) a riblike part of a plant or animal (such as a middle rib of a leaf or a thickened vein of an insect wing) | - |
| costalgia | (noun) pain in the chest caused by inflammation of the muscles between the ribs | Synonyms: pleuralgia, pleurodynia |
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