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单词 cobalt
释义

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cobalt

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cobalt

(koʊbɔːlt)
1. uncountable noun
Cobalt is a hard silvery-white metal which is used to harden steel and for producing a blue dye.
...a country rich in copper, cobalt and diamonds.
2. colour
Cobalt or cobalt blue is a deep-blue colour.
They walked past stalls selling huge sprays of crimson, saffron and cobalt flowers.
...a woman in a soft cobalt blue dress.

cobalt in British English

(ˈkəʊbɔːlt)
noun
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
Word origin
C17: German Kobalt, from Middle High German kobolt goblin; from the miners' belief that malicious goblins placed it in the silver ore

cobalt in American English

(ˈkoʊˌbɔlt)
noun
a hard, lustrous, steel-gray, ductile, metallic chemical element, found in various ores: it is used in the preparation of magnetic, wear-resistant, and high-strength alloys: its compounds are used in the production of inks, paints, and varnishes: symbol, Co; at. no., 27: a radioactive isotope (cobalt-60) is used in the treatment of cancer, in research, etc.
Word origin
Ger kobalt: so named (c. 1730) by Georg Brandt (1694-1768), Swed chemist < Ger kobold, lit., goblin; term used for the ore by miners, who regarded it as worthless andas injurious because of its arsenic content

Image of
cobalt

picture of cobalt
© farbled, shutterstock

Examples of 'cobalt' in a sentence
cobalt

My dress is cobalt blue and my shoes silvery grey.
Times, Sunday Times (2015)
Similarly, a cobalt dress worn with navy shoes and a navy bag will look less stiff.
Times, Sunday Times (2013)
Her eyebrows are bubble gum, her lips are tangerine and her eyes are cobalt blue.
Times, Sunday Times (2006)
He is about to be a human sacrifice, covered in cobalt blue.
Times, Sunday Times (2007)
In return the Chinese got a lucrative slice of the country's huge copper and cobalt reserves.
The Sun (2011)
Give your working wardrobe a style overhaul with this season's colour palette of pastel pinks, deep berries and cobalt blues.
The Sun (2013)
A splash of scarlet can be most effective when contrasted with equally unequivocal colours, such as cobalt blue, imperial purple and clear yellow.
Times, Sunday Times (2014)

Word lists with
cobalt

chemical

In other languages
cobalt

British English: cobalt NOUN
Cobalt is a hard silvery-white metal which is used to harden steel and for producing a blue dye.
...a country rich in copper, cobalt and diamonds.
  • American English: cobalt
  • Brazilian Portuguese: cobalto
  • Chinese: 钴
  • European Spanish: cobalto
  • French: cobalt
  • German: Kobalt
  • Italian: cobalto
  • Japanese: コバルト
  • Korean: 코발트
  • European Portuguese: cobalto
  • Latin American Spanish: cobalto

All related terms of 'cobalt'

cobalt blue
any greenish-blue pigment containing cobalt aluminate , usually made by heating cobaltous sulphate , aluminium oxide , and phosphoric acid together
cobalt bomb
a cobalt-60 device used in radiotherapy
cobalt bloom
a pink to purple secondary mineral consisting of hydrated cobalt arsenate in monoclinic crystalline form. Formula: Co 3 ( AsO 4 ) 2 .8H 2 O
cobaltite
a rare silvery-white mineral consisting of cobalt arsenic sulphide in cubic crystalline form: a major ore of cobalt, used in ceramics . Formula: CoAsS
Thénard's blue
any greenish-blue pigment containing cobalt aluminate , usually made by heating cobaltous sulphate , aluminium oxide , and phosphoric acid together
erythrite
a pink to purple secondary mineral consisting of hydrated cobalt arsenate in monoclinic crystalline form. Formula: Co 3 ( AsO 4 ) 2 .8H 2 O
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更新时间：2025/2/3 11:09:06