/ Dictionary / Index P phosphate group: Meaning and Definition of Find definitions for: phos'phate group" Pronunciation: [key] — Chem. Chem. the group or radical obtained by removal of one or more hydrogen atoms from phosphoric acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phosphate phosphate rock Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language