• (a.) Of, pertaining to, or designating, a hypothetical sulphacid (called also thioarsenic acid) analogous to arsenic acid, and known only in its salts.
Sulph`ar·sen'ic adjective [ Sulph o- + arsenic .] (Chemistry) Of, pertaining to, or designating, a hypothetical sulphacid (called also thioarsenic acid ) analogous to arsenic acid, and known only in its salts.