cyanogen

[sahy-an-uh-juhn, -jen]
noun
1.
a colorless, poisonous, flammable, water-soluble gas, C 2 N 2 , having an almondlike odor: used chiefly in organic synthesis.

Origin:
1820–30; cyano-1 + -gen

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World English Dictionary
cyanogen (saɪˈænədʒɪn)
 
n
an extremely poisonous colourless flammable gas with an almond-like odour: has been used in chemical warfare. Formula: (CN)2
 
[C19: from French cyanogène; see cyano-, -gen; so named because it is one of the constituents of Prussian blue]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Chlorination of water contaminated with cyanide produces the compound cyanogen chloride.
During water chlorination, cyanogen chloride may be produced at low levels.
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