| circumvolution | (noun) the act of turning or winding or folding around a central axis | - |
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| circumvolve | (verb) cause to turn on an axis or center | Synonyms: rotate |
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| circus | (noun) a performance given by a traveling company of acrobats, clowns, and trained animals | - |
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| (noun) a frenetic disorganized (and often comic) disturbance suggestive of a large public entertainment | Synonyms: carnival |
| (noun) an arena consisting of an oval or circular area enclosed by tiers of seats and usually covered by a tent | - |
| (noun) (antiquity) an open-air stadium for chariot races and gladiatorial games | - |
| (noun) a travelling company of entertainers; including trained animals | - |
| cirio | (noun) candlewood of Mexico and southwestern California having tall columnar stems and bearing honey-scented creamy yellow flowers | Synonyms: boojum tree, Fouquieria columnaris, Idria columnaris |
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| cirque | (noun) a steep-walled semicircular basin in a mountain; may contain a lake | Synonyms: corrie, cwm |
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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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| cirrhus | (noun) usually coiled | Synonyms: cirrus |
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| cirriped | (noun) marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaces | Synonyms: barnacle, cirripede |
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| cirripede | (noun) marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaces | Synonyms: barnacle, cirriped |
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| cirrocumulus | (noun) a cloud at a high altitude consisting of a series of regularly arranged small clouds resembling ripples | Synonyms: cirrocumulus cloud |
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| cirrostratus | (noun) a thin uniform layer of hazy cloud at high altitude | Synonyms: cirrostratus cloud |
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| cirrus | (noun) a slender flexible animal appendage as on barnacles or crinoids or many insects; often tactile | - |
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| (noun) a wispy white cloud (usually of fine ice crystals) at a high altitude (4 to 8 miles) | Synonyms: cirrus cloud |
| (noun) usually coiled | Synonyms: cirrhus |
| cisalpine | (adjective) on the Italian or Roman side of the Alps | Synonyms: ultramontane |
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| cisco | (noun) important food fish of cold deep lakes of North America | Synonyms: Coregonus artedi, lake herring |
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| (noun) cold-water fish caught in Lake Superior and northward | Synonyms: lake herring |
| cislunar | (adjective) situated between the earth and the moon | Synonyms: sublunar, sublunary |
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| cismontane | (adjective) on this (the speaker's) side of the mountains | - |
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| cissy | (adjective) having unsuitable feminine qualities | Synonyms: effeminate, emasculate, epicene, sissified, sissy, sissyish |
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| cistern | (noun) an artificial reservoir for storing liquids; especially an underground tank for storing rainwater | - |
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| (noun) a tank that holds the water used to flush a toilet | Synonyms: water tank |
| (noun) a sac or cavity containing fluid especially lymph or cerebrospinal fluid | Synonyms: cisterna |
| cisterna | (noun) a sac or cavity containing fluid especially lymph or cerebrospinal fluid | Synonyms: cistern |
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| cistron | (noun) (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity | Synonyms: factor, gene |
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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.) | - |
| cite | (noun) a short note recognizing a source of information or of a quoted passage | Synonyms: acknowledgment, citation, credit, mention, quotation, reference |
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| (verb) make reference to | Synonyms: advert, bring up, mention, name, refer |
| (verb) commend | Synonyms: mention |
| (verb) repeat a passage from | Synonyms: quote |
| (verb) refer to for illustration or proof | Synonyms: quote |
| (verb) advance evidence for | Synonyms: abduce, adduce |
| (verb) call in an official matter, such as to attend court | Synonyms: summon, summons |
| (verb) refer to | Synonyms: reference |
| cither | (noun) a musical stringed instrument with strings stretched over a flat sounding board; it is laid flat and played with a plectrum and with fingers | Synonyms: zither, zithern |
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| (noun) a 16th century musical instrument resembling a guitar with a pear-shaped soundbox and wire strings | Synonyms: cithern, citole, cittern, gittern |
| cithern | (noun) a 16th century musical instrument resembling a guitar with a pear-shaped soundbox and wire strings | Synonyms: cither, citole, cittern, gittern |
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| citified | (adjective) being or having the customs or manners or dress of a city person | Synonyms: city-born, city-bred, cityfied |
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| citify | (verb) accustom to urban ways | - |
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| citizen | (noun) a native or naturalized member of a state or other political community | - |
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| citizenry | (noun) the body of citizens of a state or country | Synonyms: people |
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| citizenship | (noun) conduct as a citizen | - |
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| (noun) the status of a citizen with rights and duties | - |
| citole | (noun) a 16th century musical instrument resembling a guitar with a pear-shaped soundbox and wire strings | Synonyms: cither, cithern, cittern, gittern |
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| citrange | (noun) more aromatic and acid tasting than oranges; used in beverages and marmalade | - |
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| (noun) more aromatic and acidic than oranges | Synonyms: citrange tree, Citroncirus webberi |
| citrate | (noun) a salt or ester of citric acid | - |
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| (verb) cause to form a salt or ester of citric acid | - |
| citric | (adjective) of or related to citric acid | - |
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| citrin | (noun) a vitamin that maintains the resistance of cell and capillary walls to permeation | Synonyms: bioflavinoid, vitamin P |
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| citrine | (noun) semiprecious yellow quartz resembling topaz | - |
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| citron | (noun) large lemonlike fruit with thick aromatic rind; usually preserved | - |
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| (noun) thorny evergreen small tree or shrub of India widely cultivated for its large lemonlike fruits that have thick warty rind | Synonyms: citron tree, Citrus medica |
| citronwood | (noun) wood of a citron tree | - |
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| (noun) durable fragrant wood; used in building (as in the roof of the cathedral at Cordova, Spain) | Synonyms: sandarac |
| citrous | (adjective) of or relating to or producing fruit of the plants of the genus Citrus | - |
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| (adjective) of or relating to plants of the genus Citrus | - |
| citrulline | (noun) an amino acid that does not occur in proteins but is an intermediate in the conversion of ornithine to arginine | - |
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| citrus | (noun) any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions | Synonyms: citrous fruit, citrus fruit |
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| (noun) any of numerous tropical usually thorny evergreen trees of the genus Citrus having leathery evergreen leaves and widely cultivated for their juicy edible fruits having leathery aromatic rinds | Synonyms: citrus tree |
| cittern | (noun) a 16th century musical instrument resembling a guitar with a pear-shaped soundbox and wire strings | Synonyms: cither, cithern, citole, gittern |
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| city | (noun) people living in a large densely populated municipality | Synonyms: metropolis |
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| (noun) a large and densely populated urban area; may include several independent administrative districts | Synonyms: metropolis, urban center |
| (noun) an incorporated administrative district established by state charter | - |
| cityfied | (adjective) being or having the customs or manners or dress of a city person | Synonyms: citified, city-born, city-bred |
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| cityscape | (noun) painting depicting a city or urban area | - |
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| (noun) a viewpoint toward a city or other heavily populated area | - |
| citywide | (adjective) occurring or extending throughout a city | - |
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| cive | (noun) perennial having hollow cylindrical leaves used for seasoning | Synonyms: Allium schoenoprasum, chive, chives, schnittlaugh |
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| civet | (noun) cat-like mammal typically secreting musk used in perfumes | Synonyms: civet cat |
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| civic | (adjective) of or relating or belonging to a city | - |
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| (adjective) of or relating to or befitting citizens as individuals | Synonyms: civil |
| civics | (noun) the social science of civic affairs | - |
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| civies | (noun) civilian garb as opposed to a military uniform | Synonyms: civvies |
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| civil | (adjective) not rude; marked by satisfactory (or especially minimal) adherence to social usages and sufficient but not noteworthy consideration for others | Synonyms: polite |
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| (adjective) (of divisions of time) legally recognized in ordinary affairs of life | - |
| (adjective) of or relating to or befitting citizens as individuals | Synonyms: civic |
| (adjective) of or occurring within the state or between or among citizens of the state | - |
| (adjective) applying to ordinary citizens as contrasted with the military | - |
| (adjective) of or in a condition of social order | - |
| civilian | (adjective) associated with civil life or performed by persons who are not active members of the military | - |
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| (noun) a nonmilitary citizen | - |
| civilisation | (noun) the quality of excellence in thought and manners and taste | Synonyms: civilization, refinement |
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| (noun) a society in an advanced state of social development (e.g., with complex legal and political and religious organizations) | Synonyms: civilization |
| (noun) a particular society at a particular time and place | Synonyms: civilization, culture |
| (noun) the social process whereby societies achieve an advanced stage of development and organization | Synonyms: civilization |
| civilise | (verb) raise from a barbaric to a civilized state | Synonyms: civilize |
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| (verb) teach or refine to be discriminative in taste or judgment | Synonyms: civilize, cultivate, educate, school, train |
| civilised | (adjective) having a high state of culture and development both social and technological | Synonyms: civilized |
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| (adjective) marked by refinement in taste and manners | Synonyms: civilized, cultivated, cultured, genteel, polite |
| civility | (noun) the act of showing regard for others | Synonyms: politeness |
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| (noun) formal or perfunctory politeness | - |
| civilization | (noun) the quality of excellence in thought and manners and taste | Synonyms: civilisation, refinement |
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| (noun) a society in an advanced state of social development (e.g., with complex legal and political and religious organizations) | Synonyms: civilisation |
| (noun) a particular society at a particular time and place | Synonyms: civilisation, culture |
| (noun) the social process whereby societies achieve an advanced stage of development and organization | Synonyms: civilisation |
| civilize | (verb) raise from a barbaric to a civilized state | Synonyms: civilise |
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| (verb) teach or refine to be discriminative in taste or judgment | Synonyms: civilise, cultivate, educate, school, train |
| civilized | (adjective) having a high state of culture and development both social and technological | Synonyms: civilised |
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| (adjective) marked by refinement in taste and manners | Synonyms: civilised, cultivated, cultured, genteel, polite |
| civilly | (adverb) in a civil manner | - |
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| civvies | (noun) civilian garb as opposed to a military uniform | Synonyms: civies |
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