A substance composed of a cyanogen group in combination with some element or radical; esp., potassium cyanide, KCN, or sodium cyanide, NaCN, extremely poisonous, white, crystalline compounds with an odor of bitter almonds: used in electroplating, extracting gold from low-grade ores, etc.
They've been killing themselves with cyanide pills, Rainy added.
By dry distillation it gives ammonium cyanide.
For this reason the acid copper-bath is not used for iron or zinc objects, a bath containing copper cyanide or oxide dissolved in potassium cyanide being substituted.
Potassium cyanide, KNC, and sodium cyanide, NaNC, are two of the most important of the salts of hydrocyanic acid, the former being manufactured in large quantities for consumption in the extraction of gold.
Potassium cyanide is an excessively poisonous, colourless, deliquescent solid; it is readily soluble in water, but almost insoluble in absolute alcohol.