Sulphacid
Sulph`ac´id
| n. | 1. | (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. |
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.