The Collaborative International Dictionary
Persulphocyanogen
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.
Wiktionary
persulphocyanogen
n. (context organic compound English) thiocyanogen