Definition: sulphate

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Source: WordNet (r) 1.7 

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

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.