Source : Webster's Revised Unabridged Dictionary (1913)

Sulpharsenic \Sulph`ar*sen"ic\, a. [Sulpho- + arsenic.] (Chem.)
   Of, pertaining to, or designating, a hypothetical sulphacid
   (called also thioarsenic acid) analogous to arsenic acid, and
   known only in its salts.