xanthogen

from The Collaborative International Dictionary of English v.0.48

Xanthogen \Xan"tho*gen\, n. [Xantho- + -gen.] (Chem.)
   (a) The hypothetical radical supposed to be characteristic of
       xanthic acid. [Archaic]
   (b) Persulphocyanogen. [R.]
       [1913 Webster]