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WordReference Random House Unabridged Dictionary of American English © 2024hy′drogen cy′anide, - Chemistrya colorless poisonous gas, HCN, having a bitter almondlike odor: in aqueous solution it forms hydrocyanic acid.
Collins Concise English Dictionary © HarperCollins Publishers:: hydrogen cyanide n - a colourless poisonous liquid with a faint odour of bitter almonds, usually made by a catalysed reaction between ammonia, oxygen, and methane. It forms prussic acid in aqueous solution and is used for making plastics and dyes and as a war gas. Formula: HCN
Also called: hydrocyanic acid
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