Definition of cobalt noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈkəʊbɔːlt//
    ; NAmE NAmE//ˈkoʊbɔːlt//
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  1. 1 (symbol Co) a chemical element. Cobalt is a hard silver-white metal, often mixed with other metals and used to give a deep blue-green colour to glass.
  2. 2 (also cobalt blue) a deep blue-green colour More Like This Colour compounds baby blue, china-blue, cobalt blue, electric blue, ice-blue, midnight blue, navy blue, peacock blue, petrol blue, powder blue, royal blue, sky-blue blood-red, cherry red, pillar-box red, wine red bottle-green, emerald green, jade green, lime green, olive-green, pea-green, sea-green lemon yellow, primrose yellow lily-white, snow-white coal-black, jet black, pitch-black charcoal grey, iron-grey, slate-grey rose pink, salmon pink, shocking pink nut-brownSee worksheet.
  3. Word Originlate 17th cent.: from German Kobalt ‘imp, demon’ (from the belief that cobalt was harmful to the ores with which it occurred).
See the Oxford Advanced American Dictionary entry: cobalt