A class of brachiopods, existing from the Lower Cambrian to the present day, in which the shell is chitinophosphatic, the valves are not hinged by teeth and sockets, and the pedicle is thick.
Lingulata
- Church’s thesis
- churl
- churn
- churn flow
- Churyumov–Gerasimenko, Comet 67P/
- Chu Shih-chieh (1300)
- Chu, Steven
- Chu Teh
- chyle
- chylomicron
- chyme
- chymosin
- chymotrypsin
- chymotrypsinogen
- Chytridiomycota
- Chézy formula
- ch’eng
- Ch’in dynasty
- Ch’ing dynasty
- CI
- Ciano, Count Galeazzo (1903–44)
- Cibola Flight Experiment Satellite
- cicada
- CICERO
- Cicero, Marcus Tullius (106–43)