Meaning of cobalt in English:


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mass noun
  • 1

    (also Co)
    The chemical element of atomic number 27, a hard silvery-white magnetic metal.

    ‘This packing arrangement is also observed for many metals, including rubidium, osmium, cobalt, zinc, and cadmium.’
    • ‘Besides gold and diamonds, the area is rich in copper, uranium, palladium and cobalt, as well as coltan ore.’
    • ‘The slow growth rate is thought to enhance the absorption of heavy metals like copper and cobalt from sea water.’
    • ‘We are already exporting gold and we have substantial resources of silver, uranium, nickel and cobalt, the deposits of which need further investigation.’
    • ‘They blended and heated plutonium with gallium and cobalt and then slowly cooled the molten mixture.’
    1. 1.1
      short for cobalt blue
      as modifier ‘a cobalt sky’
      • ‘He muttered something in angry fluent French, as he tilted his head back and looked up at the star-dusted cobalt sky.’
      • ‘It was February with cobalt skies, snappy air, and a fresh blanket of snow.’
      • ‘This past week in the forest park, the fiery foliage set against cobalt skies was a sight to behold.’
      • ‘I got out my sketch book and showed him some of the paintings I'd done of lizard head spires piercing skies of cobalt and turpentine.’
      • ‘Above, the serrated edge of the granite ridge cuts through the cobalt sky.’
      • ‘His gaze caught mine and for a second his cobalt eyes were a mirror for the sun.’
      • ‘Not only were his eyes lacking their normal cobalt hue and his pupils disturbingly restricted but now his eyes were blood shot as well.’
      • ‘The softly tailored look is also very much in this season with glowing colours such as cobalt and rich greens coupled with subtly shaded creams and browns.’
      • ‘And then came the third line, a collection in shades of aquamarine, cobalt, ethereal blue, sky blue, and dream blue.’
      • ‘The cloudless sky was the color of cobalt, so blue he felt he could breathe it in and out and become a part of it.’
      • ‘Other houses' bathrooms are characterised by bright cobalt blues or pearl whites.’
      • ‘On a walk through the five-acre garden you encounter great bushes of Blue Bonnet, whose huge flower heads vary from powder blue to cobalt.’
      • ‘It was of dark cobalt, running to purple, and had golden thread work all along the hem and sleeves.’
      • ‘He lifted up his cobalt eyes to his friend for only a split second and then glanced back down.’
      • ‘Side plates at each place setting are coloured a brilliant turquoise or patterned in cobalt or shaped like river boats.’
      • ‘The purple on his surcoat made his striking cobalt eyes seem deep violet.’
      • ‘What snatches of blue sky she could see were deepening from azure to cobalt and she thought she saw the first star twinkling already.’
      • ‘He left a tip and walked outside to his cobalt truck, driving away only a few moments later.’
      • ‘He took her hand and kissed it, his cobalt eyes twinkling.’
      • ‘His stormy cobalt eyes glanced down at her and he sighed again.’

Cobalt is chiefly obtained as a by-product from nickel and copper ores. It is a transition metal similar in many respects to nickel and is mainly used as a component of magnetic alloys and those designed for use at high temperatures



/ˈkəʊbɔːlt/ /ˈkəʊbɒlt/


Late 17th century from German Kobalt ‘imp, demon’ (because the presence of cobalt-bearing ore made it more difficult to extract silver, and miners believed that it was harmful to the silver ore with which it occurred).