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cobalt

[ koh-bawlt ]

noun

  1. a silver-white metallic element with a faint pinkish tinge, occurring in compounds whose silicates afford important blue coloring substances for ceramics. : Co; : 58.933; : 27; : 8.9 at 20°C.


cobalt

/ ˈəʊɔː /

noun

  1. a brittle hard silvery-white element that is a ferromagnetic metal: occurs principally in cobaltite and smaltite and is widely used in alloys. The radioisotope cobalt-60 , with a half-life of 5.3 years, is used in radiotherapy and as a tracer. Symbol: Co; atomic no: 27; atomic wt: 58.93320; valency: 2 or 3; relative density: 8.9; melting pt: 1495°C; boiling pt: 2928°C
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

cobalt

  1. A silvery-white, hard, brittle metallic element that occurs widely in metal ores. It is used to make magnetic alloys, heat-resistant alloys, and blue pigment for ceramics and glass. Atomic number 27; atomic weight 58.9332; melting point 1,495°C; boiling point 2,900°C; specific gravity 8.9; valence 2, 3.
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Word History and Origins

Origin of cobalt1

1675–85; < German Kobalt, variant of Kobold kobold
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Word History and Origins

Origin of cobalt1

C17: German Kobalt, from Middle High German kobolt goblin; from the miners' belief that malicious goblins placed it in the silver ore
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Example Sentences

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China dominates the production of rare earths and critical metals like cobalt and lithium.

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Albanese's proposed reserve includes rare earths as well as other critical minerals of which Australia is a top producer - like lithium and cobalt.

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Shasta with puffy white clouds drifting across a cobalt blue sky, Griffin recalled one of his worst days on the job.

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The brothers themselves appeared in court via a video feed from a San Diego prison, wearing identical cobalt blue prison uniforms.

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DR Congo has large deposits of coltan and cobalt, used in electronic equipment and batteries for electric cars, which are currently largely extracted by Chinese mining companies.

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cobalamincobalt 60