sīanəjə̇n, -ˌjen noun
( -s )
Etymology: French cyanogène, from cyan- + -gène -gen
1. : a univalent radical −CN present in hydrogen cyanide and other simple and complex cyanides (as ferricyanides) — called also cyano group ; compare isocyano
2. : a colorless flammable poisonous gas (CN) 2 having an odor like that of peach leaves, variously formed (as by heating mercuric cyanide), and polymerizing readily — called also dicyanogen