- calcedony
- calceiform
- calceolaria
- calciferol
- calcinator
- calcining
- calcitonin
- calcium carbide
- calcium hydrate
- calcium hydride
- calcium lactate
- calcium nitrate
- calcium phosphate
- calcium sulphate
- calculated
- calculating
- calculation
- calculations
- calculation regarding hour of marriage
- calculative
- calculi
- calculi (plural of calculus)
- calculator
- calculus of variations
- calcutta
- calcuttan
- calderon de la barca
- calder
- caldwell
- caledonia
- caledonian canal
- calendar
- calendar week
- calendar method of birth control
- calf bone
- calf's brain
- calf's tongue
- calf's milk teeth
- cali
- calico aster
- calico bush
- california black walnut
- california buckthorn
- california coffee
- california dandelion
- california four o'clock
- california lady's slipper
- california newt
- california personality inventory
- california olive