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Definition of cobalt noun from the Oxford Advanced American Dictionary

     

    cobalt

     noun
    noun
    NAmE//ˈkoʊbɔlt//
     
    [uncountable]
     
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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 color to glass.
  2. 2(also cobalt blue) a deep blue-green color
See cobalt in the Oxford Advanced Learner's Dictionary
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