- coagulase
- catalase
- collagenase
- copepoda
- cycloplegic
- cider gum
- cidarwood oil
- cambrian
- coding DNA
- congealing point
- clerk
- chemosynthtic
- cryogenic
- cataracta brunescens
- cholehaemochromogen
- conversant with
- conversant with the vedanta system of philosophy
- chemosorptive
- chemotherapeutic
- colossus of rhodes
- craniotabes
- chelating agent
- concurrent execution
- catling
- carpet snake
- cannel coal
- clear display
- cerebelo_pontine tumour
- cerebral pseudotumour
- cerebral angioma
- charity case
- Chinook Jargon
- catoptric
- civil libertarian
- common caper
- civil right
- cappadocian
- card_to_magnetic tape conversion
- cerogras
- cero
- corticosterone
- command sergeant major
- cataphoria
- cuirass
- corselet
- cataphylaxis
- cephalothoracopagus twin
- chloroma
- chloramine
- continuity irish republican army