- congenital pancytopenia
- chyloderma
- conger eel
- chilean bonito
- chile bonito
- clupea harengus pallasii
- Clupea harangus
- counterinsurgency
- crate
- cheapjack
- crier
- chapman
- collector
- commercial treaty
- chaplain
- child molester
- cowslip
- chiralgia
- causalgia
- chest pain
- cannikin
- colchicine
- Castilleja miniata
- Castilleja sessiliflora
- Castilleja sulphurea
- Castilleja chromosa
- chrysanthemum coccineum
- chrysemys picta
- coleus blumei
- colorist
- cubist
- catamount
- compound lever
- clipper
- coal tongs
- cembalo
- conjugation
- crossing
- chinese white cabbage
- chum up
- chum
- castle
- cream violet
- color property
- civilisation
- cortex
- civilization
- Clovis culture
- cerebral mantle
- cerebral cortex