/ Dictionary / Index H hydroxyapatite: Meaning and Definition of Find definitions for: hy•drox•y•ap•a•tite Pronunciation: (hī-drok"sē-ap'u-tīt"), [key] — n. a mineral, Ca(PO)OH, that is the principal storage form of calcium and phosphorus in bone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hydroxy acid hydroxybenzene Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language