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.
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   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]

The Collaborative International Dictionary of English v.0.48:

Berlin \Ber"lin\, n. [The capital of Germany]
   1. A four-wheeled carriage, having a sheltered seat behind
      the body and separate from it, invented in the 17th
      century, at Berlin.
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   2. Fine worsted for fancy-work; zephyr worsted; -- called
      also Berlin wool.
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   Berlin black, a black varnish, drying with almost a dead
      surface; -- used for coating the better kinds of ironware.
      --Ure.

   Berlin blue, Prussian blue. --Ure.

   Berlin green, a complex cyanide of iron, used as a green
      dye, and similar to Prussian blue.

   Berlin iron, a very fusible variety of cast iron, from
      which figures and other delicate articles are
      manufactured. These are often stained or lacquered in
      imitation of bronze.

   Berlin shop, a shop for the sale of worsted embroidery and
      the materials for such work.

   Berlin work, worsted embroidery.
      [1913 Webster] Berm

The Collaborative International Dictionary of English v.0.48:

Blue \Blue\ (bl[=u]), n.
   1. One of the seven colors into which the rays of light
      divide themselves, when refracted through a glass prism;
      the color of the clear sky, or a color resembling that,
      whether lighter or darker; a pigment having such color.
      Sometimes, poetically, the sky; as, to fly off into the
      blue.
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   2. A pedantic woman; a bluestocking. [Colloq.]
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   3. pl. [Short for blue devils.] Low spirits; a fit of
      despondency; melancholy. [Colloq.]
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   Berlin blue, Prussian blue.

   Mineral blue. See under Mineral.

   Prussian blue. See under Prussian.
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