2 syllables: Co, balt. Stress on Co.
KOH-bawlt
/ˈkoʊˌbɔlt/
Cobalt is pronounced KOH-bawlt (/ˈkoʊˌbɔlt/). It has two syllables (Co-balt), with the stress on "Co". Cobalt is a hard, silvery-blue chemical element with symbol Co and atomic number 27. It is widely used in alloys, batteries, and pigments. In common usage, the term also refers to a deep blue color resembling the metal’s hue, or to cobalt-containing substances.
nounCobalt is a hard, silvery-blue chemical element with symbol Co and atomic number 27. It is widely used in alloys, batteries, and pigments. In common usage, the term also refers to a deep blue color resembling the metal’s hue, or to cobalt-containing substances.
How to Pronounce Cobalt
"The engineer selected cobalt-containing alloys for the turbine blades to improve strength and heat resistance."
"Artists often mix cobalt blue for a vivid, cool-toned pigment in glass and ceramics."
"The manufacturer reported a steady supply of cobalt for rechargeable battery production."
US: /ˈkoʊ.bɔːlt/; UK/AU: /ˈkəʊ.bɒlt/. The first syllable is stressed. In American usage, the vowel in the first syllable is a long O, followed by an r-less 'bɔːlt' with a broad, open back vowel. In UK/AU, the first syllable uses /əʊ/ (no stressed 'o' sound on 'Co-'), and the second syllable uses /bɒlt/ with a short, rounded 'o' as in 'cot'. Speak clearly: 'COH-bahlt' (US) or 'KOH-balt' with final 'lt' released.
Common errors include misplacing the stress (saying ‘coBALT’ instead of ‘CO-balt’ in American usage) and blending the second syllable too strongly as /bɑːlt/ or /bɔːlt/ without the correct /ɒ/ or /ɔː/ sound. Some learners tense the jaw and say ‘cuh-BOAL-t’ or pronounce the second syllable with an /eɪ/ diphthong. Correct by keeping primary stress on the first syllable, using /bɔːlt/ (US) or /bɒlt/ (UK/AU) for the second syllable, and ensuring the final 'lt' is lightly released.
US typically /ˈkoʊ.bɔːlt/, with a long O and a broad 'aw' in the second syllable. UK/AU tends to /ˈkəʊ.bɒlt/, with a reduced first syllable /əʊ/ and a short 'o' in the second syllable. The rhotics differ: US maintains r-colored influence in some speakers, UK/AU are non-rhotic, so the final 't' is clear but the preceding vowel quality shifts. In fast speech, Americans may reduce the first vowel slightly, while in UK/AU the /əʊ/ remains prominent.
Two main challenges: the first syllable has a stressed, tense vowel that can be mispronounced as a schwa or shortened by some speakers; the second syllable contains /ɔː/ (US) vs /ɒ/ (UK/AU) before the /lt/ cluster, which is easy to blur in rapid speech. Additionally, the 'lt' final can lead to l-velarization or a d or t-like stop in some accents. Focus on keeping the first syllable strong and the second syllable precise with a crisp /lt/ ending.
Yes: the 'Co-' prefix sometimes gets a slight vowel reduction in casual speech, but careful speakers maintain the initial /oʊ/ (US) or /əʊ/ (UK/AU) vowel before the /b/ consonant. The transition from the vowel to /b/ should be smooth, not abrupt, to avoid blending with the /b/ or turning the word into /ˈkoʊbɔlt/ or /ˈkəʊbɑlt/. Emphasize the first syllable’s vowel and the clear /lt/ release for accurate speech.
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Cobalt comes from the German word kobold, meaning goblin or evil spirit. This name was applied by miners in the 18th century when the ore (cobaltite) yielded valuable metals only after smelting; the ore’s unwanted impurities and deceptive chemistry confounded early refiners, as if a goblin thwarting discovery. The element was later isolated in 1735 by Georg Brandt, who identified cobalt as a distinct element, distinguishing it from arsenic and nickel-bearing minerals. The symbol 'Co' stems from cobalt’s Latinized name, cobaltum. Over time, cobalt’s role expanded beyond metallurgy to pigments (notably cobalt blue) and, in the 20th century, to high-tech applications like lithium-ion batteries, perennially associated with its distinctive blue hue and high-temperature stability. First known use: 1735 (isolation). The term cobalt, as a color descriptor, entered English later in the 19th century, aligning with the deep, vibrant blue associated with cobalt-laden glazes and minerals. The word’s semantic arc reflects its mineral origins, industrial utility, and cultural imprint in art and technology.
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💡 These words have similar meanings to "Cobalt" and can often be used interchangeably.
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Words that rhyme with "Cobalt"
-oat sounds
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