The Collaborative International Dictionary of English v.0.48:

Gibel \Gib"el\, n. [G. gibel, giebel.] (Zool.)
   A kind of carp (Cyprinus gibelio); -- called also Prussian
   carp.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Prussian \Prus"sian\, a. [From Prussia, the country: cf. F.
   prussien.]
   Of or pertaining to Prussia. -- n. A native or inhabitant of
   Prussia.
   [1913 Webster]

   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.
      [1913 Webster]