n :  any of various phosphates of calcium: as  a  :  the phosphate CaHPO₄ used in pharmaceutical preparations and animal feeds  b  :  a naturally occurring phosphate of calcium Ca₅(F,Cl,OH,½CO₃)(PO₄)₃ that contains other elements or radicals and is the chief constituent of bones and teeth .
 
 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.