| cattail | (noun) tall erect herbs with sword-shaped leaves; cosmopolitan in fresh and salt marshes | - |
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| cattalo | (noun) hardy breed of cattle resulting from crossing domestic cattle with the American buffalo; yields leaner beef than conventional breeds | Synonyms: beefalo |
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| cefotaxime | (noun) a parenteral cephalosporin (trade name Claforan) used for severe infections of the lungs or throat or ears or urinary tract | Synonyms: Claforan |
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| ceftazidime | (noun) a parenteral cephalosporin (trade names Fortaz and Tazicef) used to treat moderate infections | Synonyms: Fortaz, Tazicef |
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| celesta | (noun) a musical instrument consisting of graduated steel plates that are struck by hammers activated by a keyboard | - |
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| cenotaph | (noun) a monument built to honor people whose remains are interred elsewhere or whose remains cannot be recovered | Synonyms: empty tomb |
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| cental | (noun) a United States unit of weight equivalent to 100 pounds | Synonyms: centner, cwt, hundredweight, quintal, short hundredweight |
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| centare | (noun) a unit of measurement for area, defined as the area of a square with sides of exactly 1 metre; a centiare is 1/100th of an are | Synonyms: square meter, square metre |
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| centas | (noun) 100 centas equal 1 litas in Lithuania | - |
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| centaur | (noun) (classical mythology) a mythical being that is half man and half horse | - |
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| centaury | (noun) any plant of the genus Centaurea | - |
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| (noun) any of various plants of the genus Centaurium | - |
| centavo | (noun) a fractional monetary unit of several countries: El Salvador and Sao Tome and Principe and Brazil and Argentina and Bolivia and Colombia and Cuba and the Dominican Republic and Ecuador and El Salvador and Guatemala and Honduras and Mexico and Nicaragua and Peru and the Philippines and Portugal | - |
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| centripetal | (adjective) tending to move toward a center | - |
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| (adjective) of a nerve fiber or impulse originating outside and passing toward the central nervous system | Synonyms: receptive, sensory |
| (adjective) tending to unify | Synonyms: unifying |
| cerivastatin | (noun) an oral drug (trade name Baycol) to reduce blood cholesterol levels | Synonyms: Baycol |
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| certain | (adjective) established beyond doubt or question; definitely known | - |
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| (adjective) having or feeling no doubt or uncertainty; confident and assured | Synonyms: sure |
| (adjective) certain to occur; destined or inevitable | Synonyms: sure |
| (adjective) established irrevocably | Synonyms: sealed |
| (adjective) exercising or taking care great enough to bring assurance | Synonyms: sure |
| (adjective) definite but not specified or identified | - |
| (adjective) reliable in operation or effect | Synonyms: sure |
| certainly | (adverb) definitely or positively (`sure' is sometimes used informally for `surely') | Synonyms: for certain, for sure, sure, sure as shooting, sure enough, surely |
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| certainty | (noun) something that is certain | Synonyms: foregone conclusion, sure thing |
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| (noun) the state of being certain | - |
| cetacean | (adjective) of or relating to whales and dolphins etc | Synonyms: cetaceous |
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| (noun) large aquatic carnivorous mammal with fin-like forelimbs no hind limbs, including: whales, dolphins, porpoises, narwhals | Synonyms: blower, cetacean mammal |
| cetaceous | (adjective) of or relating to whales and dolphins etc | Synonyms: cetacean |
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| chaeta | (noun) a stiff chitinous seta or bristle especially of an annelid worm | - |
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| chaetal | (adjective) of or relating to chaetae (setae or bristles) | - |
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| chantarelle | (noun) widely distributed edible mushroom rich yellow in color with a smooth cap and a pleasant apricot aroma | Synonyms: Cantharellus cibarius, chanterelle |
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| charitable | (adjective) full of love and generosity | - |
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| (adjective) relating to or characterized by charity | - |
| (adjective) showing or motivated by sympathy and understanding and generosity | Synonyms: benevolent, good-hearted, kindly, large-hearted, openhearted, sympathetic |
| charitableness | (noun) generosity as manifested by practicing charity (as for the poor or unfortunate) | - |
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| charitably | (adverb) in a charitable manner | - |
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| charlatan | (noun) a flamboyant deceiver; one who attracts customers with tricks or jokes | Synonyms: mountebank |
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| charlatanism | (noun) the dishonesty of a charlatan | Synonyms: quackery |
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| chartaceous | (adjective) of or like paper | Synonyms: paperlike, papery |
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| cheetah | (noun) long-legged spotted cat of Africa and southwestern Asia having nonretractile claws; the swiftest mammal; can be trained to run down game | Synonyms: Acinonyx jubatus, chetah |
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| chemoattractant | (noun) a substance inducing positive chemotaxis in motile cells. | - |
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| chemotaxis | (noun) movement by a cell or organism in reaction to a chemical stimulus | - |
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| chetah | (noun) long-legged spotted cat of Africa and southwestern Asia having nonretractile claws; the swiftest mammal; can be trained to run down game | Synonyms: Acinonyx jubatus, cheetah |
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| chevrotain | (noun) very small hornless deer-like ruminant of tropical Asia and west Africa | Synonyms: mouse deer |
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| chieftain | (noun) the head of a tribe or clan | Synonyms: chief, headman, tribal chief |
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| (noun) the leader of a group of people | Synonyms: captain |
| chieftaincy | (noun) the position of chieftain | Synonyms: chieftainship |
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| chieftainship | (noun) the position of chieftain | Synonyms: chieftaincy |
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| chigetai | (noun) Mongolian wild ass | Synonyms: dziggetai, Equus hemionus hemionus |
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| chimneystack | (noun) the part of the chimney that is above the roof; usually has several flues | - |
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| chipolata | (noun) a small thin sausage | - |
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| chittamwood | (noun) deciduous tree of southeastern United States and Mexico | Synonyms: black haw, Bumelia lanuginosa, chittimwood, false buckthorn, shittimwood |
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| (noun) shrubby tree of the Pacific coast of the United States; yields cascara sagrada | Synonyms: bearberry, bearwood, cascara buckthorn, chittimwood, Rhamnus purshianus |
| (noun) shrubby tree of southern United States having large plumes of feathery flowers resembling puffs of smoke | Synonyms: American smokewood, Cotinus americanus, Cotinus obovatus |
| cholestasis | (noun) a condition in which little or no bile is secreted or the flow of bile into the digestive tract is obstructed | Synonyms: acholia |
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| circumstance | (noun) information that should be kept in mind when making a decision | Synonyms: condition, consideration |
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| (noun) formal ceremony about important occasions | - |
| (noun) a condition that accompanies or influences some event or activity | - |
| (noun) the set of facts or circumstances that surround a situation or event | Synonyms: context, setting |
| circumstances | (noun) a person's financial situation (good or bad) | - |
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| (noun) your overall circumstances or condition in life (including everything that happens to you) | Synonyms: destiny, fate, fortune, lot, luck, portion |
| circumstantial | (adjective) fully detailed and specific about particulars | - |
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| circumstantially | (adverb) insofar as the circumstances are concerned | - |
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| (adverb) without advance planning | Synonyms: accidentally, by chance, unexpectedly |
| (adverb) in minute detail | Synonyms: minutely |
| (adverb) according to circumstances | - |
| circumstantiate | (verb) give circumstantial evidence for | - |
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| cismontane | (adjective) on this (the speaker's) side of the mountains | - |
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| citadel | (noun) a stronghold into which people could go for shelter during a battle | Synonyms: bastion |
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| citation | (noun) an official award (as for bravery or service) usually given as formal public statement | Synonyms: commendation |
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| (noun) a short note recognizing a source of information or of a quoted passage | Synonyms: acknowledgment, cite, credit, mention, quotation, reference |
| (noun) a summons that commands the appearance of a party at a proceeding | - |
| (noun) a passage or expression that is quoted or cited | Synonyms: quotation, quote |
| (noun) (law) the act of citing (as of spoken words or written passages or legal precedents etc.) | - |
| clientage | (noun) relation of a client to a patron | - |
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| coarctate | (adjective) (of an insect pupa) enclosed in a rigid case | - |
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| coarctation | (noun) (biology) a narrowing or constriction of a vessel or canal; especially a congenital narrowing of the aorta | - |
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| (noun) tight or narrow compression | Synonyms: constriction |
| coastal | (adjective) located on or near or bordering on a coast | - |
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| (adjective) of or relating to a coast | - |
| (adjective) along or following a coast | Synonyms: coastwise |
| coattail | (noun) the loose back flap of a coat that hangs below the waist | - |
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| cocktail | (noun) a short mixed drink | - |
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| (noun) an appetizer served as a first course at a meal | - |
| codetalker | (noun) a secret agent who was one of the Navajos who devised and used a code based on their native language; the code was unbroken by the Japanese during World War II | Synonyms: windtalker |
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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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| coetaneous | (adjective) of the same period | Synonyms: coeval, contemporaneous |
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| cogitable | (adjective) capable of being thought about | Synonyms: ponderable |
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| cogitate | (verb) use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments | Synonyms: cerebrate, think |
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| (verb) consider carefully and deeply; reflect upon; turn over in one's mind | - |
| cogitation | (noun) attentive consideration and meditation | Synonyms: study |
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| (noun) a carefully considered thought about something | - |
| cogitative | (adjective) of or relating to having capacities for cogitation | - |
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| (adjective) given to cogitation | - |
| cohabitation | (noun) the act of living together and having a sexual relationship (especially without being married) | - |
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| coincidental | (adjective) occurring or operating at the same time | Synonyms: co-occurrent, coincident, coinciding, concurrent, cooccurring, simultaneous |
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| coincidentally | (adverb) happening at the same time | Synonyms: coincidently |
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| coital | (adjective) of or relating to coitus or copulation | Synonyms: copulatory |
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| collectable | (adjective) subject to or requiring payment especially as specified | Synonyms: collectible, payable |
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| (noun) things considered to be worth collecting (not necessarily valuable or antique) | Synonyms: collectible |
| colorectal | (adjective) relating to or affecting the colon and the rectum | - |
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| coltan | (noun) a valuable black mineral combining niobite and tantalite; used in cell phones and computer chips | Synonyms: columbite-tantalite |
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| combatant | (adjective) engaging in or ready for combat | - |
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| (noun) someone who fights (or is fighting) | Synonyms: battler, belligerent, fighter, scrapper |
| cometary | (adjective) of or relating to or resembling a comet | Synonyms: cometic |
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| comfortable | (adjective) providing or experiencing physical well-being or relief (`comfy' is informal) | Synonyms: comfy |
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| (adjective) free from stress or conducive to mental ease; having or affording peace of mind | - |
| (adjective) in fortunate circumstances financially; moderately rich | Synonyms: easy, prosperous, well-fixed, well-heeled, well-off, well-situated, well-to-do |
| (adjective) sufficient to provide comfort | - |
| (adjective) having a wide margin | - |
| comfortableness | (noun) a feeling of being at ease in a relationship | - |
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| (noun) a state of being relaxed and feeling no pain | Synonyms: comfort |
| comfortably | (adverb) in mental comfort; without stress | - |
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| (adverb) in financial comfort | Synonyms: well |
| (adverb) in physical comfort | - |
| commentary | (noun) a written explanation or criticism or illustration that is added to a book or other textual material | Synonyms: comment |
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| commentate | (verb) serve as a commentator, as in sportscasting | - |
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| (verb) make a commentary on | - |
| commentator | (noun) a writer who reports and analyzes events of the day | Synonyms: reviewer |
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| (noun) an expert who observes and comments on something | Synonyms: observer |
| committal | (noun) the official act of consigning a person to confinement (as in a prison or mental hospital) | Synonyms: commitment, consignment |
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| (noun) the act of committing a crime | Synonyms: commission, perpetration |
| commutability | (noun) the quality of being commutable | Synonyms: transmutability |
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| (noun) exchangeability by virtue of being replaceable | Synonyms: replaceability, substitutability |
| commutable | (adjective) subject to alteration or change | - |
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| (adjective) capable of being exchanged for another or for something else that is equivalent | Synonyms: substitutable |
| commutate | (verb) reverse the direction of (an alternating electric current) each half cycle so as to produce a unidirectional current | - |
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| commutation | (noun) the travel of a commuter | Synonyms: commuting |
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| (noun) (law) the reduction in severity of a punishment imposed by law | Synonyms: re-sentencing |
| (noun) the act of putting one thing or person in the place of another: | Synonyms: exchange, substitution |
| (noun) a warrant substituting a lesser punishment for a greater one | - |
| commutative | (adjective) (of a binary operation) independent of order; as in e.g. "a x b = b x a" | - |
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| commutator | (noun) switch for reversing the direction of an electric current | - |
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| compartmental | (adjective) divided up into compartments or categories | Synonyms: compartmentalised, compartmentalized |
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| compartmentalisation | (noun) the act of distributing things into classes or categories of the same type | Synonyms: assortment, categorisation, categorization, classification, compartmentalization |
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| (noun) a mild state of dissociation | Synonyms: compartmentalization |
| compartmentalise | (verb) separate into isolated compartments or categories | Synonyms: compartmentalize, cut up |
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| compartmentalised | (adjective) divided up into compartments or categories | Synonyms: compartmental, compartmentalized |
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| compartmentalization | (noun) the act of distributing things into classes or categories of the same type | Synonyms: assortment, categorisation, categorization, classification, compartmentalisation |
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| (noun) a mild state of dissociation | Synonyms: compartmentalisation |
| compartmentalize | (verb) separate into isolated compartments or categories | Synonyms: compartmentalise, cut up |
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| compartmentalized | (adjective) divided up into compartments or categories | Synonyms: compartmental, compartmentalised |
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| complemental | (adjective) acting as or providing a complement (something that completes the whole) | Synonyms: complementary, completing |
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| complementarity | (noun) a relation between two opposite states or principles that together exhaust the possibilities | - |
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| (noun) the interrelation of reciprocity whereby one thing supplements or depends on the other | - |
| complementary | (adjective) acting as or providing a complement (something that completes the whole) | Synonyms: complemental, completing |
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| (adjective) of words or propositions so related that each is the negation of the other | - |
| (noun) either one of two chromatic colors that when mixed together give white (in the case of lights) or grey (in the case of pigments) | Synonyms: complementary color |
| complementation | (noun) (linguistics) a distribution of related speech sounds or forms in such a way that they only appear in different contexts | Synonyms: complementary distribution |
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| (noun) the grammatical relation of a word or phrase to a predicate | - |
| complimentariness | (noun) The state or quality of being in the nature of an expression of praise, congratulation, encouragement, or respect. | - |
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| complimentary | (adjective) conveying or resembling a compliment | - |
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| (adjective) costing nothing | Synonyms: costless, free, gratis, gratuitous |
| computable | (adjective) may be computed or estimated | Synonyms: estimable |
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| computation | (noun) the procedure of calculating; determining something by mathematical or logical methods | Synonyms: calculation, computing |
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| (noun) problem solving that involves numbers or quantities | Synonyms: calculation, figuring, reckoning |
| computational | (adjective) of or involving computation or computers | - |
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