Dictionary![]() ![]() cy•an•o•genPronunciation: (sī-an'u-jun, -jen"), [key] —n. 1. a colorless, poisonous, flammable, water-soluble gas, C2N2, having an almondlike odor: used chiefly in organic synthesis. 2. See cyano group. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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