| cachalot | (noun) large whale with a large cavity in the head containing spermaceti and oil; also a source of ambergris | Synonyms: black whale, Physeter catodon, sperm whale |
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| catchall | (noun) an enclosure or receptacle for odds and ends | - |
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| chachalaca | (noun) slender arboreal guan resembling a wild turkey; native to Central America and Mexico; highly regarded as game birds | - |
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| chalaza | (noun) one of two spiral bands of tissue connecting the egg yolk to the enclosing membrane at either end of the shell | - |
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| (noun) basal part of a plant ovule opposite the micropyle; where integument and nucellus are joined | - |
| chalazion | (noun) a small sebaceous cyst of the eyelid resulting when a Meibomian gland is blocked | Synonyms: Meibomian cyst |
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| chalcanthite | (noun) hydrated blue crystalline form of copper sulfate | Synonyms: blue copperas, blue stone, blue vitriol |
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| chalcedony | (noun) a milky or greyish translucent to transparent quartz | Synonyms: calcedony |
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| chalcid | (noun) any of various tiny insects whose larvae are parasites on eggs and larvae of other insects; many are beneficial in destroying injurious insects | Synonyms: chalcid fly, chalcid wasp, chalcidfly |
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| chalcidfly | (noun) any of various tiny insects whose larvae are parasites on eggs and larvae of other insects; many are beneficial in destroying injurious insects | Synonyms: chalcid, chalcid fly, chalcid wasp |
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| chalcocite | (noun) a heavy grey mineral that is an ore of copper | Synonyms: copper glance |
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| chalcopyrite | (noun) a yellow copper ore (CuFeS2) made up of copper and iron sulfide | Synonyms: copper pyrites |
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| chaldron | (noun) a British imperial capacity measure (liquid or dry) equal to 36 bushels | - |
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| chalet | (noun) a Swiss house with a sloping roof and wide eaves or a house built in this style | - |
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| chalice | (noun) a bowl-shaped drinking vessel; especially the Eucharistic cup | Synonyms: goblet |
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| chalk | (noun) a piece of calcite or a similar substance, usually in the shape of a crayon, that is used to write or draw on blackboards or other flat surfaces | - |
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| (noun) an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant | Synonyms: chicken feed, crank, deoxyephedrine, glass, ice, meth, methamphetamine, methamphetamine hydrochloride, Methedrine, shabu, trash |
| (noun) a pure flat white with little reflectance | - |
| (noun) a soft whitish calcite | - |
| (verb) write, draw, or trace with chalk | - |
| chalkboard | (noun) sheet of slate; for writing with chalk | Synonyms: blackboard |
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| chalkpit | (noun) a quarry for chalk | Synonyms: chalk pit |
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| chalkstone | (noun) a deposit of urates around a joint or in the external ear; diagnostic of advanced or chronic gout | Synonyms: tophus |
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| chalky | (adjective) composed of or containing or resembling calcium carbonate or calcite or chalk | Synonyms: calcareous |
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| (adjective) of something having the color of chalk | - |
| challah | (noun) (Judaism) a loaf of white bread containing eggs and leavened with yeast; often formed into braided loaves and glazed with eggs before baking | Synonyms: hallah |
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| challenge | (noun) a call to engage in a contest or fight | - |
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| (noun) questioning a statement and demanding an explanation | - |
| (noun) a formal objection to the selection of a particular person as a juror | - |
| (noun) a demand by a sentry for a password or identification | - |
| (noun) a demanding or stimulating situation | - |
| (verb) issue a challenge to | - |
| (verb) take exception to | Synonyms: dispute, gainsay |
| (verb) raise a formal objection in a court of law | Synonyms: take exception |
| (verb) ask for identification | - |
| challengeable | (adjective) capable of being challenged | - |
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| challenger | (noun) the contestant you hope to defeat | Synonyms: competition, competitor, contender, rival |
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| challenging | (adjective) requiring full use of your abilities or resources | Synonyms: ambitious |
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| (adjective) disturbingly provocative | Synonyms: intriguing |
| (adjective) stimulating interest or thought | Synonyms: thought-provoking |
| challis | (noun) a soft lightweight fabric (usually printed) | - |
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| chalybeate | (adjective) containing or impregnated with or tasting of iron | - |
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| chalybite | (noun) iron ore in the form of ferrous carbonate | Synonyms: siderite |
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| counterchallenge | (verb) challenge in turn | - |
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| epochal | (adjective) highly significant or important especially bringing about or marking the beginning of a new development or era | Synonyms: epoch-making |
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| eschalot | (noun) type of onion plant producing small clustered mild-flavored bulbs used as seasoning | Synonyms: Allium ascalonicum, Allium cepa aggregatum, multiplier onion, shallot |
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| hierarchal | (adjective) classified according to various criteria into successive levels or layers | Synonyms: hierarchic, hierarchical |
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| isochalaz | (noun) a line indicating a constant frequency of hail storms. | - |
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| matriarchal | (adjective) characteristic of a matriarchy | - |
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| monarchal | (adjective) having the characteristics of or befitting or worthy of a monarch | Synonyms: monarchical |
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| (adjective) ruled by or having the supreme power resting with a monarch | Synonyms: monarchic, monarchical |
| nonchalance | (noun) the trait of remaining calm and seeming not to care; a casual lack of concern | Synonyms: indifference, unconcern |
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| nonchalant | (adjective) marked by blithe unconcern | Synonyms: casual, insouciant |
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| nonchalantly | (adverb) in an unconcerned manner | Synonyms: casually |
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| (adverb) in a composed and unconcerned manner | Synonyms: coolly, nervelessly |
| paschal | (adjective) of or relating to Passover or Easter | - |
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| patriarchal | (adjective) characteristic of a form of social organization in which the male is the family head and title is traced through the male line | - |
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| (adjective) relating to or characteristic of a man who is older or higher in rank | - |
| seneschal | (noun) the chief steward or butler of a great household | Synonyms: major-domo |
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| stomachal | (adjective) relating to or involving the stomach | Synonyms: gastric, stomachic |
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| unchallengeable | (adjective) not open to challenge | - |
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| unchallenged | (adjective) generally agreed upon; not subject to dispute | Synonyms: undisputed, unquestioned |
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