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The Collaborative International Dictionary
perthiocyanogen

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
perthiocyanogen

n. (context chemistry English) persulphocyanogen