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• cobalt 60 (noun)
  1. a radioactive isotope of cobalt with mass number 60; a source of exceptionally intense gamma rays; used in radiation therapy
• cobalt bloom (noun)
  1. a reddish mineral consisting of hydrated cobalt arsenate in monoclinic crystalline form and used in colouring glass; usually found in veins bearing cobalt and arsenic
• cobalt blue (noun)
  1. a shade of blue tinged with green
  2. greenish-blue pigment consisting essentially of cobalt oxide and alumina
• cobalt ultramarine (noun)
  1. greenish-blue pigment consisting essentially of cobalt oxide and alumina
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