n. [ Pref. di- + sulphate. ] (Chem.) (a) A salt of disulphuric or pyrosulphuric acid; a pyrosulphate. (b) An acid salt of sulphuric acid, having only one equivalent of base to two of the acid. [ 1913 Webster ]
n. [ NL. sulphas, sulphatis, fr. L. sulphur, sulfur, brimstone, sulphur: cf. F. sulfate. ] (Chem.) A salt of sulphuric acid. [ 1913 Webster ]