- collectivized
- collectivised
- collocation
- colloquium
- conference preparatory committees
- conference call
- conspergent
- cooperative spirit
- cooperative enterprise
- chamber of princes
- conrad potter aiken
- clinoid process
- cnicus benedictus
- castilla
- cnemidophorus velox
- crepitant
- cheloid
- chamaeleontidae
- chilopoda
- chrysosplenium americanum
- carlina acaulis
- cestode
- coextensive
- centaurea americana
- coffea arabica
- cirrus cloud
- cirsium arvense
- chrysopsis mariana
- Caprifoliaceae
- chronically
- contradictory
- coquerty
- celebrated (through one's own self)
- counterfeit coin
- counterfactual
- complex quantity
- crossed fingers
- cleansing cream
- contextual definition
- corroborating evidence
- circumferent
- conscientiousness
- conformance
- conformation to rule
- conformation to social values
- ceramics
- clapboard
- cover a multitude of sins
- cover song
- cover version