Source : Webster's Revised Unabridged Dictionary (1913)

Prussian \Prus"sian\, a. [From Prussia, the country: cf. F.
   prussien.]
   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} (Zo["o]l.) See {Gibel}.

   {Prussian green}. (Chem.) Same as {Berlin green}, under
      {Berlin}.