Source : Webster's Revised Unabridged Dictionary (1913)

Persulphocyanogen \Per*sul`pho*cy*an"o*gen\, n. (Chem.)
   An orange-yellow substance, produced by the action of
   chlorine or boiling dilute nitric acid and sulphocyanate of
   potassium; -- called also {pseudosulphocyanogen},
   {perthiocyanogen}, and formerly {sulphocyanogen}.