- camus
- coffee can
- canicula
- canetti
- church key
- can of worms
- coconut meat
- co_educate
- coeducate
- concealed accidental bleeding
- concealed accidental haemorrhage
- chemical physiology
- cotton mill
- chemical pneumonitis
- carnal abuse
- competency
- cultus
- ceratopteris pteridioides
- control grid
- centre round
- centerfielder
- copestone
- counter revolution
- common factor
- common divisor
- comme il faut
- cross section
- conditional probability
- contingent probability
- candidness
- Carpinaceae
- Corylaceae
- crewelwork
- Chrysolepis
- Castanopsis
- Castanea
- candlewick
- cutwork
- Carpinus
- Corylus
- common beet
- candy thermometer
- cryometer
- Centigrade thermometer
- centigrade scale
- Celsius scale
- conformism
- categorised
- cold fusion
- culinary art