potassium cyanide
/P AH0 T AE1 S IY0 AH0 M S AY1 AH0 N AY0 D/noun
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(inorganic chemistry) The potassium salt of hydrocyanic acid, KCN; the colourless crystals are soluble in water, and it is extremely poisonous, and is used in electroplating, the extraction of gold and silver from their ores, and in photography.
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