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2 definitions found
 for cobalt blue
From The Collaborative International Dictionary of English v.0.48 :

  Cobalt \Co"balt\ (k[=o]"b[o^]lt; 277, 74), n. [G. kobalt, prob.
     fr. kobold, kobel, goblin, MHG. kobolt; perh. akin to G.
     koben pigsty, hut, AS. cofa room, cofgodas household gods,
     Icel. kofi hut. If so, the ending -old stands for older
     -walt, -wald, being the same as -ald in E. herald and the
     word would mean ruler or governor in a house, house spirit,
     the metal being so called by miners, because it was poisonous
     and troublesome. Cf. Kobold, Cove, Goblin.]
     1. (Chem.) A tough, lustrous, reddish white metal of the iron
        group, not easily fusible, and somewhat magnetic. Atomic
        weight 59.1. Symbol Co.
        [1913 Webster]
  
     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.
           [1913 Webster]
  
     2. A commercial name of a crude arsenic used as fly poison.
        [1913 Webster]
  
     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.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

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

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