Persulphocyanic

Per`sul`pho`cy`an´ic


a.1.(Chem.) Pertaining to, or designating, a yellow crystalline substance (called also perthiocyanic acid), analogous to sulphocyanic acid, but containing more sulphur.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.