[1] : The Collaborative International Dictionary of English v.0.48

cobalt \co"balt\ k=o"bo^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
see also:
kobold cove goblin cobalt bloom erythrite cobalt blue 
cobalt ultramarine thenard's blue cobalt crust cobalt glance cobaltite 
cobalt green rinman's green cobalt yellow 

[2] : 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
see also:
greenish blue aqua aquamarine turquoise peacock blue cobalt ultramarine 

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