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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 Ber·lin n.
 1. A four-wheeled carriage, having a sheltered seat behind the body and separate from it, invented in the 17th century, at Berlin.
 2. Fine worsted for fancy-work; zephyr worsted; -- called also Berlin wool.
 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.

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 Blue 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.
 2. A pedantic woman; a bluestocking. [Colloq.]
 3. pl.  Low spirits; a fit of despondency; melancholy. [Colloq.]
 Berlin blue, Prussian blue.
 Mineral blue. See under Mineral.
 Prussian blue. See under Prussian.