| cubitus | n. | one of (usu. three) major veins in insect wing; elbow; forearm | biology | |
| cuckooing | n. | exploitation of vulnerable people’s homes for criminal activity, esp. that related to the distribution of drugs | British | |
| culm | n. | 1 | plant stem, esp. of grass or sedge | botany |
| culm | n. | 2 | waste coal or coal dust; inferior anthracite | |
| cultivar | n. | plant variety created by selective breeding | ||
| culverin | n. | handheld weapon of the 14th & early 15th Centuries; small cannon | ||
| cumber | v. | to hinder or hamper, to burden | ||
| cumbrous | adj. | unwieldy, cumbersome | ||
| cumshaw | n. | gratuity, present, tip | ||
| cumulet | n. | white domesticated pigeon | ||
| curate | n. | assistant to rector or vicar | ||
| curate’s egg | n. | something asserted to be both bad and good, but which is entirely awful | idiom | |
| curiologic | adj. | of hieroglyphic writing in which pictures directly represent objects; of pictorial representation as in a rebus | ||
| currawong | n. | medium-sized crowlike songbird of Australia | ||
| curricle | n. | two-wheeled light carriage drawn by two horses abreast | ||
| curtilage | n. | ground surrounding a dwelling, sometimes including outbuildings, considered the same as the residence itself | ||
| curule chair | n. | seat modeled after ancient camp chair with open back and curved legs and often decorated with ivory in which only the highest magistrates of ancient Rome were privileged to sit | ||
| curvet | n. | leap of rearing horse in dressage in which the hind legs are kicked out as the front legs descend; to leap in this manner | ||
| cuspidorian | n. | person tasked with cleaning and maintaining cuspidors | ||
| customary | n. | consuetudinary, customal, custumal, written account of local customs or usages of a manor or region | ||
| cut the cackle | v. | stop messing about (and move on to serious matters) | British | |
| cutler | n. | seller or repairer of knives | ||
| cwm | n. | steep narrow valley, cirque | ||
| cwt | n. | abbreviation for hundredweight | ||
| cyclamen | n. | perennial of the primrose family with white, red, or pink flowers | ||
| cyclostyle | n. | early duplicating device in which a toothed rowel is used to create holes in a stencil through which ink is forced | ||
| cynosure | n. | center of attention; guiding star | ||
| czardas | n. | Hungarian dance with slow start and frenetic finish | ||
| dace | n. | small freshwater fish similar to roach or chub | ||
| dacoit | n. | member of thieving class in India and Burma | ||
| dacron | n. | polyester material used for thread and cloth | ||
| dactyloscopic | adj. | of or related to fingerprints | ||
| dado | n. | lower part of interior wall when finished differently than upper portion; grooved slot in board into which another board is fixed | ||
| daedal | adj. | clever, adroit | ||
| dally | v. | to loiter; to delay by trifling; to talk idly; to toy with, esp. in amorous pursuit | ||
| daltonism | n. | color-blindness, esp. between red and green | ||
| damselfly | n. | slender, winged insect of same order as dragonflies, from which it is distinguished by having its wings folded back along the body | ||
| damson | n. | small dark purple or black plum; dark to medium violet | ||
| dandiprat | n. | hateworthy person or person of no consequence | obsolete | |
| Dannert wire | n. | concertina wire, coiled barbed or razor wire | ||
| dapperling | n. | dwarf or child, esp. one neatly dressed; mushroom of the Agaricaceae family | ||
| darbies | n. | handcuffs | British | |
| dark lantern | n. | lantern with a shutter to hide the light | ||
| davenport | n. | large sofa, often a sofa bed | ||
| dawamesc | n. | greenish edible paste or marmalade consisting of hashish mixed with butter, sugar or honey, pistachios, cinnamon and other spices, musk, nutmeg, pine nuts, orange juice | ||
| deadworks | n. | those parts of a laden ship above the waterline | nautical | |
| deal | adj. | made of fir or pine, or from planks of such wood | ||
| debauch | v. | to seduce, to corrupt | ||
| debenture | n. | unsecured loan certificate; fixed-rate bond; drawback certificate against imported goods | ||
| debile | adj. | feeble | obsolete |