# cobalt
## English
### Etymology

From German Kobalt, formerly also Kobald, ‑olt, ‑old, ‑elt, ‑el, apparently the same word as Kobold (“goblin”), from Middle High German, which became also a Harz Mountains silver miners’ term for rock laced with arsenic and sulfur, so called because it degraded the ore and made the miners ill. Doublet of kobold.

### Pronunciation

* IPA: /ˈkəʊ.bɒlt/, /ˈkəʊ.bɔːlt/
* (US) enPR: kō'bôlt, IPA: /ˈkoʊ.bɔlt/
** (cot–caught merger) IPA: /ˈkoʊ.bɑlt/
* Audio (US):(file)

### Noun

cobalt (usually uncountable, plural cobalts)
* A chemical element (symbol Co) with an atomic number of 27: a hard, lustrous, silver-gray metal.
* Cobalt blue.

#### Derived terms

* anticobalt
* cobalamin
* cobalt-60
* cobaltamine
* cobaltammine
* cobaltarthurite
* cobaltate
* cobaltaustinite
* cobalt-bicarbonate method
* cobalt-bloom
* cobalt blue
* cobalt bomb
* cobalt-bronze
* cobalt chelatase
* cobalt cheletase
* cobalt chloride
* cobalt crust
* cobalt dichloride
* cobalt difluoride
* cobalt fluoride
* cobalt-glance
* cobalt green
* cobalti-
* cobaltian
* cobaltic
* cobaltiferous
* cobalt(II) sulfate
* cobaltite
* cobaltkieserite
* cobaltkoritnigite
* cobaltlike
* cobaltlotharmeyerite
* cobalto-
* cobaltoan
* cobaltocene
* cobaltocheletase
* cobaltomenite
* cobaltous
* cobalt oxide
* cobalt-pyrites
* cobalt red
* cobalt-sixty
* cobalt-speiss
* cobalt therapy
* cobalttsumcorite
* cobalt ultramarine
* cobalt violet
* cobalt-vitriol
* cobalt yellow
* cobamide
* cobinamide
* dicobalt
* earthy cobalt
* gray cobalt
* grey cobalt
* luteocobalt
* noncobalt
* organocobalt
* praseocobalt
* purpureocobalt
* radiocobalt
* red cobalt
* samarium-cobalt magnet
* silver-white cobalt
* telecobalt
* tin-white cobalt
* tricobalt

#### Translations
### See also

* asbolan, asbolite
* erythrite
* glaucodot
* skutterudite
* smaltine

### References

* ↑ “cobalt, n.”, in OED Online ⁠, Oxford: Oxford University Press, launched 2000.
* ↑ Douglas Harper (2001–2025) “cobalt (n.)”, in Online Etymology Dictionary.

## Catalan
### Etymology

Borrowed from German Kobalt.

### Pronunciation

* IPA: (Central) [kuˈβal]
* IPA: (Balearic, Valencia) [koˈbalt]
* Audio (Valencia):(file)

### Noun

cobalt m (uncountable)
* cobalt

### Further reading

* “cobalt” in Diccionari de la llengua catalana, segona edició, Institut d’Estudis Catalans.
* “cobalt”, in Gran Diccionari de la Llengua Catalana, Grup Enciclopèdia Catalana, 2025
* “cobalt” in Diccionari normatiu valencià, Acadèmia Valenciana de la Llengua.
* “cobalt” in Diccionari català-valencià-balear, Antoni Maria Alcover and Francesc de Borja Moll, 1962.

## Danish
### Alternative forms

* kobolt (official spelling)
* kobalt

### Etymology

From German Kobold.

### Noun

cobalt c (singular definite cobalten or cobaltet, not used in plural form)
* cobalt

#### Declension
### References

* “cobalt” in Den Danske Ordbog

## French
### Etymology

Borrowed from German Kobalt.

### Pronunciation

* IPA: /kɔ.balt/
* Audio:(file)

### Noun

cobalt m (plural cobalts)
* cobalt

### Further reading

* “cobalt”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

## Occitan
### Etymology

From German Kobalt.

### Pronunciation

* This entry needs pronunciation information. If you are familiar with the IPA then please add some!

### Noun

cobalt m (uncountable)
* cobalt

## Romanian
### Etymology

Borrowed from French cobalt or German Kobalt, from German Kobold (“goblin”).

### Pronunciation

* IPA: /ˈkobalt/
* Hyphenation: co‧balt

### Noun

cobalt n (uncountable)
* cobalt (chemical element)

#### Declension
### References

* cobalt in DEX online—Dicționare ale limbii române (Dictionaries of the Romanian language)

## Welsh
### Etymology

Borrowed from English cobalt, from German Kobold (“goblin”).

### Pronunciation

* (North Wales) IPA: /ˈkɔbalt/
* (South Wales) IPA: /ˈkoːbalt/, /ˈkɔbalt/
* Rhymes: -ɔbalt

### Noun

cobalt m (uncountable)
* cobalt

### Mutation

Note: Certain mutated forms of some words can never occur in standard Welsh. All possible mutated forms are displayed for convenience.

### Further reading

* R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “cobalt”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies