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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Co·balt n.
 1. Chem. A tough, lustrous, reddish white metal of the iron group, not easily fusible, and somewhat magnetic. Atomic weight 59.1. Symbol Co.
 Note:It occurs in nature in combination with arsenic, sulphur, and oxygen, and is obtained from its ores, smaltite, cobaltite, asbolite, etc. Its oxide colors glass or any flux, as borax, a fine blue, and is used in the manufacture of smalt. It is frequently associated with nickel, and both are characteristic ingredients of meteoric iron.
 2. A commercial name of a crude arsenic used as fly poison.
 Cobalt bloom. Same as Erythrite.
 Cobalt blue, a dark blue pigment consisting of some salt of cobalt, as the phosphate, ignited with alumina; -- called also cobalt ultramarine, and Thenard's blue.
 Cobalt crust, earthy arseniate of cobalt.
 Cobalt glance. Min. See Cobaltite.
 Cobalt green, a pigment consisting essentially of the oxides of cobalt and zinc; -- called also Rinman's green.
 Cobalt yellow Chem., a yellow crystalline powder, regarded as a double nitrite of cobalt and potassium.
 

From: WordNet (r) 2.0

 cobalt blue
      n 1: a shade of blue tinged with green [syn: greenish blue, aqua,
            aquamarine, turquoise, peacock blue]
      2: greenish-blue pigment consisting essentially of cobalt oxide
         and alumina [syn: cobalt ultramarine]