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Webster 1913 Edition

Noun.

[Pref.

para-

cyanogen

(Chem.)

A polymeric modification of cyanogen, obtained as a brown or black amorphous residue by heating mercuric cyanide.

paracyanogen ‎(uncountable)

(chemistry) A polymeric modification of cyanogen, obtained as a brown or black amorphous residue by heating mercuric cyanide.