a. [ Ferri- + prussic. ] (Chem.) Ferricyanic. [ R. ] [ 1913 Webster ]

a. [ Ferro- + prussic. ] (Chem.) Ferrocyanic. [ 1913 Webster ]

a. [ Nitro- + prussic. ] (Chem.) Pertaining to, derived from, or designating, a complex acid called nitroprussic acid, obtained indirectly by the action of nitric acid on potassium ferrocyanide (yellow prussiate), as a red crystalline unstable substance. It forms salts called nitroprussides, which give a rich purple color with alkaline sulphides. [ 1913 Webster ]

a. [ Cf. F. prussique. ] (Old Chem.) designating the acid now called hydrocyanic acid, but formerly called prussic acid, because Prussian blue is derived from it or its compounds. See Hydrocyanic. [ 1913 Webster ]