Source : Webster's Revised Unabridged Dictionary (1913)

Sulphate \Sul"phate\, n. [NL. sulphas, sulphatis, fr. L.
   sulphur, sulfur, brimstone, sulphur: cf. F. sulfate.] (Chem.)
   A salt of sulphuric acid.

Source : WordNet®

sulphate
     n : a salt or ester of sulphuric acid [syn: {sulfate}]