Webster's 1913 Dictionary
SULPHOCYANIC
Sul `pho *cy *an "ic, a. Etym: [See Sulphur, Cyanic. ] (Chem. )
Defn: Of, pertaining to, derived from, or designating, a sulphacid, HSCN, analogous to cyanic acid, and obtained as a colorless deliquescent crystalline substance, having a bitter saline taste, and not poisonous.