- any of several phosphates of calcium occurring naturally in some rocks and in animal bones, used as a fertilizer and food additive as well as in baking powder and dentifrices.
- the insoluble nonacid calcium salt of orthophosphoric acid (phosphoric(V) acid): it occurs in bones and is the main constituent of bone ash. Formula: Ca 3 (PO 4) 2
- any calcium salt of a phosphoric acid. Calcium phosphates are found in many rocks and used esp in fertilizers
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