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From: Webster's Revised Unabridged Dictionary (1913)

 Sulph·ac·id n.  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.