Main Entry: ap·a·tite

Pronunciation: \ˈa-pə-ˌtīt\

Function: noun

Etymology: German Apatit, from Greek apatē deceit

Date: 1803

: any of a group of calcium phosphate minerals occurring in various colors as hexagonal crystals, as granular masses, or in fine-grained masses as the chief constituent of phosphate rock and of bones and teeth; especially : calcium phosphate fluoride