Source : Webster's Revised Unabridged Dictionary (1913)

Phosphate \Phos"phate\, n. (Chem.)
   A salt of phosphoric acid.

Source : WordNet®

phosphate
     n 1: a salt of phosphoric acid [syn: {orthophosphate}, {inorganic
          phosphate}]
     2: carbonated drink with fruit syrup and a little phosphoric
        acid