Fer·ro·cy·an·ic a. Chem. Pertaining to, derived from, or designating, a ferrocyanide.
ferrocyanic acid Chem., a white crystalline substance, H4(CN)6Fe, of strong acid properties, obtained from potassium ferrocyanide, and regarded as the type of the ferrocyanides; -- called also hydro-ferrocyanic acid, hydrogen ferrocyanide. etc.
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ferrocyanic acid
n : a white unstable acid formed from ferrocyanide salts