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]

Source: 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.

Source: Webster's Revised Unabridged Dictionary (1913)