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cobalt

Line breaks: co¦balt
Pronunciation: /ˈkəʊbɔːlt
 
, -ɒlt/

Definition of cobalt in English:

noun

[mass noun]
1The chemical element of atomic number 27, a hard silvery-white magnetic metal. (Symbol: Co)
Example sentences
  • This packing arrangement is also observed for many metals, including rubidium, osmium, cobalt, zinc, and cadmium.
  • Besides gold and diamonds, the area is rich in copper, uranium, palladium and cobalt, as well as coltan ore.
  • The slow growth rate is thought to enhance the absorption of heavy metals like copper and cobalt from sea water.
1.1Cobalt blue: [as modifier]: a cobalt sky
More example sentences
  • He muttered something in angry fluent French, as he tilted his head back and looked up at the star-dusted cobalt sky.
  • It was February with cobalt skies, snappy air, and a fresh blanket of snow.
  • This past week in the forest park, the fiery foliage set against cobalt skies was a sight to behold.

Cobalt is chiefly obtained as a by-product from nickel and copper ores. It is a transition metal similar in many respects to nickel and is mainly used as a component of magnetic alloys and those designed for use at high temperatures

Origin

late 17th century: from German Kobalt 'imp, demon' (because the presence of cobalt-bearing ore made it more difficult to extract silver, and miners believed that it was harmful to the silver ore with which it occurred).

Derivatives

cobaltic

1
Pronunciation: /kə(ʊ)ˈbɔːltɪk, -ˈbɒlt-/
adjective
Example sentences
  • Hydrated cobalt oxide or cobaltic hydroxide is produced by adding sodium hydroxide to this solution.
  • An opportunity might have been lost for guiding mining operations to the working of any payable cobaltic vein.
  • The cobaltic complex has also been synthesized by metal exchange from previously obtained sodium ascorbate and cobaltic dichloride hexahydrate in aqueous medium.

cobaltous

2
Pronunciation: /kə(ʊ)ˈbɔːltəs, -ˈbɒlt-/
adjective
Example sentences
  • We produce 300 tons of cobalt oxide and 180 tons of cobaltous oxide yearly, one of the largest production and sale bases in China.

Definition of cobalt in:

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