| chiton | (noun) primitive elongated bilaterally symmetrical marine mollusk having a mantle covered with eight calcareous plates | Synonyms: coat-of-mail shell, polyplacophore, sea cradle |
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| (noun) a woolen tunic worn by men and women in ancient Greece | - |
| chlorination | (noun) disinfection of water by the addition of small amounts of chlorine or a chlorine compound | - |
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| (noun) the addition or substitution of chlorine in organic compounds | - |
| chlorofluorocarbon | (noun) a fluorocarbon with chlorine; formerly used as a refrigerant and as a propellant in aerosol cans | Synonyms: CFC |
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| chlorofucin | (noun) the chlorophyll present in brown algae, diatoms, and flagellates | Synonyms: chlorophyll c |
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| chloropicrin | (noun) a heavy colorless insoluble liquid compound that causes tears and vomiting; used as a pesticide and as tear gas | Synonyms: nitrochloroform |
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| cholecystokinin | (noun) a gastrointestinal hormone that stimulates the secretion of pancreatic enzymes and the contraction and emptying of the gall bladder; its release is stimulated by the presence of fatty acids and amino acids in the small intestine | - |
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| cholesterin | (noun) an animal sterol that is normally synthesized by the liver; the most abundant steroid in animal tissues | Synonyms: cholesterol |
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| chon | (noun) 100 chon equal 1 won in North Korea | - |
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| (noun) 100 chon equal 1 won in South Korea | - |
| chondrichthian | (noun) fishes in which the skeleton may be calcified but not ossified | Synonyms: cartilaginous fish |
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| chondrin | (noun) a substance that resembles gelatin and is obtained by boiling cartilage in water | - |
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| chorion | (noun) the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals) | - |
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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 | - |
| chromatin | (noun) the readily stainable substance of a cell nucleus consisting of DNA and RNA and various proteins; during mitotic division it condenses into chromosomes | Synonyms: chromatin granule |
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| chromogen | (noun) a compound that can be converted to a pigment | - |
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| chrysarobin | (noun) a bitter yellow powder used to treat skin diseases | Synonyms: araroba, Goa powder |
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| churchman | (noun) a clergyman or other person in religious orders | Synonyms: cleric, divine, ecclesiastic |
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| churchwarden | (noun) an officer in the Episcopal church who helps a parish priest with secular matters | - |
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| churn | (noun) a vessel in which cream is agitated to separate butterfat from buttermilk | Synonyms: butter churn |
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| chylomicron | (noun) a microscopic particle of triglycerides produced in the intestines during digestion; in the bloodstream they release their fatty acids into the blood | - |
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| chymosin | (noun) an enzyme that occurs in gastric juice; causes milk to coagulate | Synonyms: rennin |
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| ciliophoran | (noun) a protozoan with a microscopic appendage extending from the surface of the cell | Synonyms: ciliate, ciliated protozoan |
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| cimarron | (noun) wild sheep of mountainous regions of western North America having massive curled horns | Synonyms: bighorn, bighorn sheep, Ovis canadensis, Rocky Mountain bighorn, Rocky Mountain sheep |
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| cinnamon | (noun) spice from the dried aromatic bark of the Ceylon cinnamon tree; used as rolled strips or ground | - |
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| (noun) tropical Asian tree with aromatic yellowish-brown bark; source of the spice cinnamon | Synonyms: Ceylon cinnamon, Ceylon cinnamon tree, Cinnamomum zeylanicum |
| (noun) aromatic bark used as a spice | Synonyms: cinnamon bark |
| ciprofloxacin | (noun) an oral antibiotic (trade name Cipro) used against serious bacterial infections of the skin or respiratory tract or urinary tract or bones or joints | Synonyms: Cipro |
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| circularisation | (noun) circulating printed notices as a means of advertising | Synonyms: circularization |
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| circularization | (noun) circulating printed notices as a means of advertising | Synonyms: circularisation |
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| circulation | (noun) the spread or transmission of something (as news or money) to a wider group or area | - |
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| (noun) the dissemination of copies of periodicals (as newspapers or magazines) | - |
| (noun) free movement or passage (as of cytoplasm within a cell or sap through a plant) | - |
| (noun) movement through a circuit; especially the movement of blood through the heart and blood vessels | - |
| (noun) number of copies of a newspaper or magazine that are sold | - |
| (noun) (library science) the count of books that are loaned by a library over a specified period | - |
| circumcision | (noun) the act of circumcising; surgical removal of the foreskin of males | - |
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| (noun) the act of circumcising performed on males eight days after birth as a Jewish and Muslim religious rite | - |
| circumduction | (noun) a circular movement of a limb or eye | - |
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| circumlocution | (noun) a style that involves indirect ways of expressing things | Synonyms: ambage, periphrasis |
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| (noun) an indirect way of expressing something | Synonyms: indirect expression |
| circumnavigation | (noun) traveling around something (by ship or plane) | - |
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| circumscription | (noun) the act of circumscribing | - |
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| circumspection | (noun) the trait of being circumspect and prudent | Synonyms: caution |
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| (noun) knowing how to avoid embarrassment or distress | Synonyms: discreetness, discretion, prudence |
| circumvention | (noun) the act of evading by going around | - |
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| circumvolution | (noun) the act of turning or winding or folding around a central axis | - |
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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 |
| 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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| 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.) | - |
| 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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| citizen | (noun) a native or naturalized member of a state or other political community | - |
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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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| 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 |
| 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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| civilian | (noun) a nonmilitary citizen | - |
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| 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 |
| 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 |
| clampdown | (noun) sudden restriction on an activity | - |
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| clan | (noun) group of people related by blood or marriage | Synonyms: kin, kin group, kindred, kinship group, tribe |
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| clansman | (noun) a male member of a clan | - |
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| clanswoman | (noun) a female member of a clan | - |
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| clarification | (noun) the act of removing solid particles from a liquid | Synonyms: clearing |
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| (noun) an interpretation that removes obstacles to understanding | Synonyms: elucidation, illumination |
| clarion | (noun) a medieval brass instrument with a clear shrill tone | - |
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| classification | (noun) the act of distributing things into classes or categories of the same type | Synonyms: assortment, categorisation, categorization, compartmentalisation, compartmentalization |
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| (noun) restriction imposed by the government on documents or weapons that are available only to certain authorized people | - |
| (noun) the basic cognitive process of arranging into classes or categories | Synonyms: categorisation, categorization, sorting |
| (noun) a group of people or things arranged by class or category | Synonyms: categorisation, categorization |
| claudication | (noun) disability of walking due to crippling of the legs or feet | Synonyms: gameness, gimp, gimpiness, lameness, limping |
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| claxon | (noun) a kind of loud horn formerly used on motor vehicles | Synonyms: klaxon |
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| clean | (noun) a weightlift in which the barbell is lifted to shoulder height and then jerked overhead | Synonyms: clean and jerk |
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| clergyman | (noun) a member of the clergy and a spiritual leader of the Christian Church | Synonyms: man of the cloth, reverend |
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| clericalization | (noun) The process of increasing the power or influence of a religious hierarchy. | - |
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| clinician | (noun) a practitioner (of medicine or psychology) who does clinical work instead of laboratory experiments | - |
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| clon | (noun) a group of genetically identical cells or organisms derived from a single cell or individual by some kind of asexual reproduction | Synonyms: clone |
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| closedown | (noun) termination of operations | Synonyms: closing, closure, shutdown |
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| clothespin | (noun) wood or plastic fastener; for holding clothes on a clothesline | Synonyms: clothes peg, clothes pin |
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| clown | (noun) a person who amuses others by ridiculous behavior | Synonyms: buffoon, goof, goofball, merry andrew |
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| (noun) a rude or vulgar fool | Synonyms: buffoon |
| cnidarian | (noun) radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms | Synonyms: coelenterate |
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| coachman | (noun) a man who drives a coach (or carriage) | - |
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| coaction | (noun) act of working jointly | Synonyms: collaboration |
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| coagulation | (noun) the process of forming semisolid lumps in a liquid | Synonyms: clotting, curdling |
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| coalbin | (noun) a bin for holding coal | Synonyms: coalhole |
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| coalition | (noun) the union of diverse things into one body or form or group; the growing together of parts | Synonyms: coalescence, coalescency, concretion, conglutination |
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| (noun) an organization of people (or countries) involved in a pact or treaty | Synonyms: alignment, alinement, alliance |
| (noun) the state of being combined into one body | Synonyms: fusion |
| coalman | (noun) someone who delivers coal | - |
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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 |
| coastguardsman | (noun) a member of a coastguard | - |
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| cobalamin | (noun) a B vitamin that is used to treat pernicious anemia | Synonyms: antipernicious anemia factor, cyanocobalamin, vitamin B12 |
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| cocain | (noun) a narcotic (alkaloid) extracted from coca leaves; used as a surface anesthetic or taken for pleasure; can become powerfully addictive | Synonyms: cocaine |
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| cochin | (noun) Asian breed of large fowl with dense plumage and feathered legs | Synonyms: cochin china |
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| cocoon | (noun) silky envelope spun by the larvae of many insects to protect pupas and by spiders to protect eggs | - |
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| codification | (noun) the act of codifying; arranging in a systematic order | - |
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| (noun) a set of rules or principles or laws (especially written ones) | Synonyms: code |
| codon | (noun) a specific sequence of three adjacent nucleotides on a strand of DNA or RNA that specifies the genetic code information for synthesizing a particular amino acid | - |
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| coeducation | (noun) education of men and women in the same institutions | - |
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| coelenteron | (noun) the saclike body cavity of a coelenterate | - |
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| coercion | (noun) using force to cause something to occur | Synonyms: compulsion |
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| (noun) the act of compelling by force of authority | - |
| coextension | (noun) equality of extension or duration | - |
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| coffin | (noun) box in which a corpse is buried or cremated | Synonyms: casket |
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| cogitation | (noun) attentive consideration and meditation | Synonyms: study |
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| (noun) a carefully considered thought about something | - |
| cognation | (noun) (anthropology) the condition of being related by blood | Synonyms: blood kinship, consanguinity |
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| (noun) line of descent traced through the maternal side of the family | Synonyms: enation, matrilineage |
| cognition | (noun) the psychological result of perception and learning and reasoning | Synonyms: knowledge, noesis |
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| cognomen | (noun) the name used to identify the members of a family (as distinguished from each member's given name) | Synonyms: family name, last name, surname |
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| (noun) a familiar name for a person (often a shortened version of a person's given name) | Synonyms: byname, moniker, nickname, sobriquet, soubriquet |
| cohabitation | (noun) the act of living together and having a sexual relationship (especially without being married) | - |
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| cohesion | (noun) (physics) the intermolecular force that holds together the molecules in a solid or liquid | - |
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| (noun) (botany) the process in some plants of parts growing together that are usually separate (such as petals) | - |
| (noun) (linguistics) the grammatical and lexical linking within a text or sentence that holds a text together and gives it meaning. | - |
| (noun) the state of cohering or sticking together | Synonyms: coherence, coherency, cohesiveness |
| coign | (noun) the keystone of an arch | Synonyms: coigne, quoin |
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| (noun) expandable metal or wooden wedge used by printers to lock up a form within a chase | Synonyms: coigne, quoin |
| coin | (noun) a flat metal piece (usually a disc) used as money | - |
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| coition | (noun) sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur | Synonyms: carnal knowledge, coitus, copulation, intercourse, relation, sex act, sexual congress, sexual intercourse, sexual relation |
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| collaboration | (noun) act of working jointly | Synonyms: coaction |
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| (noun) act of cooperating traitorously with an enemy that is occupying your country | Synonyms: collaborationism, quislingism |
| collagen | (noun) a fibrous scleroprotein in bone and cartilage and tendon and other connective tissue; yields gelatin on boiling | - |
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| collation | (noun) careful examination and comparison to note points of disagreement | - |
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| (noun) assembling in proper numerical or logical sequence | - |
| (noun) a light informal meal | Synonyms: bite, snack |
| collection | (noun) the act of gathering something together | Synonyms: aggregation, assembling, collecting |
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| (noun) a publication containing a variety of works | Synonyms: compendium |
| (noun) request for a sum of money | Synonyms: appeal, ingathering, solicitation |
| (noun) several things grouped together or considered as a whole | Synonyms: accumulation, aggregation, assemblage |
| collectivisation | (noun) the organization of a nation or economy on the basis of collectivism | Synonyms: collectivization |
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| collectivization | (noun) the organization of a nation or economy on the basis of collectivism | Synonyms: collectivisation |
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| colleen | (noun) an Irish girl | - |
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| collegian | (noun) a student (or former student) at a college or university | Synonyms: college boy, college man |
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