| cicerone | n. | knowledgeable tour guide | ||
| cinchona | n. | evergreen tree or shrub native to the Andes, now also grown in India and Java, yielding quinine | ||
| cinchonism | n. | quinine poisoning | ||
| cincture | n. | girdle, belt; enclosure | ||
| cinereous | adj. | of or related to ashes; ash-colored | ||
| circular insanity | n. | outdated term for manic-depressive disorder | obsolete | |
| circumflittergate | v. | to move around and around quickly in a purposeless and random manner | ||
| circumjacent | adj. | surrounding, in the area around | ||
| circumquaque | n. | roundabout speech or writing | ||
| circumvallation | n. | state of being surrounded by rampart or entrenchment | ||
| circumverbalistic | adj. | of the design or creation of crossword puzzles; of the solving of crossword puzzles | ||
| cispontine | adj. | of or related to this side of a bridge | ||
| cit | n. | derogatory term for citizen or city folk | ||
| cittern | n. | wire-string instrument similar to guitar, having a flat pear-shaped soundbox and asymmetric neck | ||
| clabber | v. | to curdle | ||
| clapboard | n. | board with one edge thicker than the other, used to weatherboard walls of buildings | ||
| clapper bridge | n. | old style of bridge in which large stone slabs are laid across a creek or river, usually on stone piers | ||
| clarigation | n. | solemn demand for redress made through heralds prior to declaration of war | ||
| clastic | adj. | (geology) formed from pieces of broken older rocks | ||
| cleat | n. | knob or device (often metal) used to secure lines on a nautical vessel; protrusion on shoes etc. to provide extra traction; strip secured across something to provide stability or strength | ||
| cleave | v. | 1 | to cut asunder | |
| cleave | v. | 2 | to stick fast; to adhere to (a person, principle, etc.) | |
| cleek | v. | to seize with the hand, to clutch strongly or suddenly; to snatch | ||
| clement | adj. | temperate, mild; merciful | ||
| clepsydra | n. | ancient timekeeping device using discharge of water to measure time; water-clock | ||
| clerestory | n. | upper part of building rising above interior space so as to allow the entry of daylight through high windows | ||
| clew | n. | skein or ball of yarn, etc | ||
| climb the wooden hill to Bedfordshire | v. | to go to bed, to sleep | British | |
| clinamen | n. | the unpredictable swerve of atoms, in the philosophy of Lucretius | ||
| clinker | n. | fused matter left behind from burning combustible material in furnace or forge, piece of slag | ||
| clinker-built | adj. | of a ship’s hull built with the edges of its planks overlapping, as opposed to “carvel-built” ships where the planks are fitted side-by-side and flush with one another | nautical | |
| cloche | n. | glass cover placed over plants; bell-shaped cover for plates of food; close-fitting brimmed woman’s hat | ||
| cloistral | adj. | of or related to a cloister | ||
| clonic | adj. | of or related to spasmodic muscular convulsions | ||
| closestool | n. | (also close-stool) stool with hole in its seat, beneath which is a chamber pot | ||
| clothespress | n. | cabinet or wardrobe for storing clothes | ||
| clough | n. | valley or ravine with very steep sides, defile | ||
| clunch | n. | pale limestone rock mixture (sometimes with chalk or clay) used as building material | ||
| cob | n. | male swan | ||
| coble | n. | flat-bottomed fishing boat with lugsail used in salmon fishing in Scotland and North England | ||
| cochineal | n. | scarlet or crimson dye primarily used in cookery, made of a dried powder derived from the insect of the same name | ||
| cock a snook | v. | to show contempt; to make rude hand gesture with thumb on the nose with fingers extended | idiom | |
| cock-a-hoop | adj. | vaingloriously elated | ||
| cockalorum | n. | small-minded boaster, self-important person of little merit; boasting speech | ||
| cockchafer | n. | doodlebug, large brown European beetle | ||
| cocker | n. | 1 | patron or promoter of cockfights; spaniel breed trained to start woodcocks | |
| cocker | v. | 2 | to pamper | |
| cockshut | n. | twilight, evening | obsolete | |
| cocksparrer | n. | cocky youngster | ||
| cocotte | n. | prostitute |