cobalt

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.^[1][2] Doublet of kobold.

• IPA^(key): /ˈkəʊ.bɒlt/, /ˈkəʊ.bɔːlt/
• (US) enPR: kō'bôlt, IPA^(key): /ˈkoʊ.bɔlt/
  • (cot–caught merger) IPA^(key): /ˈkoʊ.bɑlt/

• Audio (US):

  (file)

cobalt (usually uncountable, plural cobalts)

2. A chemical element (symbol Co) with an atomic number of 27: a hard, lustrous, silver-gray metal.
3. Cobalt blue.

• asbolan, asbolite
• erythrite
• glaucodot
• skutterudite
• smaltine

Borrowed from German Kobalt.

• IPA^(key): (Central) [kuˈβal]
• IPA^(key): (Balearic, Valencia) [koˈbalt]

• Audio (Valencia):

  (file)

cobalt m (uncountable)

1. cobalt

• “cobalt”, in Diccionari de la llengua catalana [Dictionary of the Catalan Language] (in Catalan), second edition, Institute of Catalan Studies [Catalan: Institut d'Estudis Catalans], April 2007
• “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.

• kobolt (official spelling)
• kobalt

From German Kobold.

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

1. cobalt

• “cobalt” in Den Danske Ordbog

Borrowed from German Kobalt.

• IPA^(key): /kɔ.balt/

• Audio:

  (file)

cobalt m (plural cobalts)

1. cobalt

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

From German Kobalt.

cobalt m (uncountable)

1. cobalt

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

• IPA^(key): /ˈkobalt/
• Hyphenation: co‧balt

cobalt n (uncountable)

1. cobalt (chemical element)

• “cobalt”, in DEX online—Dicționare ale limbii române (Dictionaries of the Romanian language) (in Romanian), 2004–2025

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

• (North Wales) IPA^(key): /ˈkɔbalt/
• (South Wales) IPA^(key): /ˈkoːbalt/, /ˈkɔbalt/
• Rhymes: -ɔbalt

cobalt m (uncountable)

1. cobalt

• 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