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The Collaborative International Dictionary of English v.0.48:

Phosphate \Phos"phate\, n. (Chem.)
   A salt of phosphoric acid or a compound containing the
   phosphate radical group -PO4; as, trisodium phosphate
   (Na3PO4); triethyl phosphate ((C2H5)3PO4).
   [1913 Webster + PJC]