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3 definitions found
 for Prussian blue
From The Collaborative International Dictionary of English v.0.48 :

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

From 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
        [1913 Webster]
     2. A pedantic woman; a bluestocking. [Colloq.]
        [1913 Webster]
     3. pl. [Short for blue devils.] Low spirits; a fit of
        despondency; melancholy. [Colloq.]
        [1913 Webster]
     Berlin blue, Prussian blue.
     Mineral blue. See under Mineral.
     Prussian blue. See under Prussian.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  Prussian blue
      n 1: any of various blue pigments [syn: iron blue, Prussian
      2: a dark greenish-blue color

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