Prus·sian a. Of or pertaining to Prussia. -- n. A native or inhabitant of Prussia.
Prussian blue Chem., any one of several complex double cyanides of ferrous and ferric iron; specifically, a dark blue amorphous substance having a coppery luster, obtained by adding a solution of potassium ferrocyanide (yellow prussiate of potash) to a ferric salt. It is used in dyeing, in ink, etc. Called also Williamson's blue, insoluble Prussian blue, Berlin blue, etc.
Prussian carp Zool. See Gibel.
Prussian green. Chem. Same as Berlin green, under Berlin.
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