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The Collaborative International Dictionary of English v.0.48:

Sulphacid \Sulph*ac"id\, n. [Sulpho- + acid.] (Chem.) An acid in which, to a greater or less extent, sulphur plays a part analogous to that of oxygen in an oxyacid; thus, thiosulphuric and sulpharsenic acids are sulphacids; -- called also sulphoacid. See the Note under Acid, n., 2. [1913 Webster]