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From The Collaborative International Dictionary of English v.0.48 [gcide]:
Cobalt \Co"balt\ (k[=o]"b[o^]lt; 277, 74), noun [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.
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.
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Definitions retrieved from the Open Source DICT Webster's English and WordNet 3.0 dictionaries. Click here for database copyright information.
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