prus·sic acid (prŭs'ĭk) n. From French acide prussique Prussian acid, so called because obtained from Prussian blue. See hydrocyanic acid.
hy·dro·cy·an·ic acid (hī'drō-sī-ān'ĭk) n. An aqueous solution of hydrogen cyanide that is a poisonous weak acid, having a characteristic smell of bitter almonds. Also called prussic acid.
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