a colorless, highly poisonous liquid, HCN, an aqueous solution of hydrogen cyanide.
another name for hydrogen cyanide, esp when in aqueous solution

hydrocyanic acid hy·dro·cy·an·ic acid (hī’drō-sī-ān’ĭk)
An aqueous solution of hydrogen cyanide that is a poisonous weak acid. Also called prussic acid.
hydrocyanic acid
An aqueous solution of hydrogen cyanide, having a characteristic smell of bitter almonds. Also called prussic acid.


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