A colorless toxic gas with a pungent almond odor; has been used in chemical warfare.

Roget 438: blue etc. adj.; garter-blue; watchet^†.    [Pigments] ultramarine, smalt, cobalt, cyanogen [Chem]; Prussian blue, syenite blue^†; bice^†, indigo; zaffer^†.    lapis lazuli, sapphire, turquoise; indicolite^†.    blueness, bluishness; bloom.    ... show more

Dutch: cyanogeen, cyaan
Polish: dwucyjan, dicyjan, cyjan