GNU Collaborative International Dictionary of English

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1.       
   Sulphacid , 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