C
- Caer - (a place-name element) stronghold or enclosure (from Cornish language ker)
- Cakey - soft, feeble minded (from 'put in with the cakes and taken out with the buns' - half baked)
- Carn - (a place-name element) heap of stones (from Cornish language carn)
- Catched - caught
- Catchpit - a place in the home where everything is dropped
- Caunse - paved way (from Cornish language cons)
- Chacking - thirsty
- Chacks - cheeks
- Cheel - child especially girl "a boy or a cheel"
- Cheldern - children
- Chimley - chimney
- Chirks - remnants of fire, embers; "chirk" burrows where used coal was found near mines
- Chy - (a place-name element) house (from Cornish language chi)
- Clacky - sticky and chewy food
- Clim (up) - climb (everywhere except west of Camborne and Helston)
- Clip - sharp in speaking, curt, having taken offence
- Cloam - crockery, pottery, earthenware
- Cloam oven - earthenware built-in oven
- Clunk - swallow; clunker - windpipe
- Cos - (a place-name element) wood (from Cornish language coos) (also sometimes: quite, from old Cornish form coit)
- Cousin Jack - a Cornish emigrant miner; "Cousin Jacks" is a nickname for the overseas Cornish, thought to derive from the practice of Cornishmen asking if job vacancies could be filled by their cousin named Jack in Cornwall.
- Crease - children's truce term (west Cornwall) (from the Cornish word for "peace")
- Crib - a mid-morning break for a snack (see below also)
- Croust (or Crowst) - a mid-morning break for a snack (usually west Cornwall) (from Cornish language croust)
- Cummas 'zon - come on, hurry up
- Cundard - a drain
- Cuss - curse
Read more about this topic: List Of Cornish Dialect Words