C c


    • US Pronunciation
    • US IPA
    • UK Pronunciation
    • UK IPA
    • [koh-bawlt]
    • /ˈkoʊ bɔlt/
    • /ˈkəʊ.bɒlt/
    • US Pronunciation
    • US IPA
    • [koh-bawlt]
    • /ˈkoʊ bɔlt/

Definitions of cobalt word

  • uncountable noun cobalt Cobalt is a hard silvery-white metal which is used to harden steel and for producing a blue dye. 3
  • colour cobalt Cobalt or cobalt blue is a deep-blue colour. 3
  • noun cobalt 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 3
  • noun cobalt 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. 3
  • noun cobalt a silver-white metallic element with a faint pinkish tinge, occurring in compounds whose silicates afford important blue coloring substances for ceramics. Symbol: Co; atomic weight: 58.933; atomic number: 27; specific gravity: 8.9 at 20°C. 1
  • noun cobalt The chemical element of atomic number 27, a hard silvery-white magnetic metal. 1

Information block about the term

Origin of cobalt

First appearance:

before 1675
One of the 48% oldest English words
1675-85; < German Kobalt, variant of Kobold kobold

Historical Comparancy

Parts of speech for Cobalt


cobalt popularity

A common word. It’s meaning is known to most children of preschool age. About 93% of English native speakers know the meaning and use the word.
Most Europeans know this English word. The frequency of it’s usage is somewhere between "mom" and "screwdriver".

cobalt usage trend in Literature

This diagram is provided by Google Ngram Viewer

Synonyms for cobalt

adj cobalt

  • turquoise — Also, turquois. an opaque mineral, a basic hydrous copper aluminum phosphate often containing a small amount of iron, sky-blue or greenish-blue in color, cut cabochon as a gem. Compare bone turquoise.
  • royal — of or relating to a king, queen, or other sovereign: royal power; a royal palace.
  • azure — Azure is used to describe things that are bright blue.
  • navy — the whole body of warships and auxiliaries belonging to a country or ruler.
  • blue-green — a color about midway between blue and green in the spectrum.

Antonyms for cobalt

adj cobalt

  • joyful — full of joy, as a person or one's heart; glad; delighted.
  • joyous — joyful; happy; jubilant: the joyous sounds of children at play.
  • lighthearted — carefree; cheerful; merry: a lighthearted laugh.
  • upbeat — an unaccented beat, especially immediately preceding a downbeat.
  • gay — of, relating to, or exhibiting sexual desire or behavior directed toward a person or persons of one's own sex; homosexual: a gay couple. Antonyms: straight.

Top questions with cobalt

  • what is cobalt?
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  • what color is cobalt?
  • how many valence electrons does cobalt have?
  • what is the atomic weight of cobalt?
  • who discovered cobalt?
  • what does cobalt mean?
  • how to mine cobalt?
  • when was cobalt discovered?
  • where is cobalt found?
  • how many protons does cobalt have?
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  • how many neutrons does cobalt have?
  • what color is cobalt blue?

See also

Matching words

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