- caffeina (U.S. and Br.) citrata effervescens (U.S.)
- caffeinism
- CaH2O2
- Cahinca root
- caincic acid
- Cajal's cells's stain
- cajeputene
- cajeputol
- caked breast
- Calabar Bean
- Calcaneum
- calcar avis
- calcarea carbonica
- calcarea fluorica
- calcarea usta
- calcareous corpuscle
- Calcarine
- calcification lines
- Calcigerous
- calcigerous cell