Noun cobalt blue has 2 senses
  1. greenish blue, aqua, aquamarine, turquoise, cobalt blue, peacock blue - a shade of blue tinged with green
    --1 is a kind of blue, blueness
  2. cobalt blue, cobalt ultramarine - greenish-blue pigment consisting essentially of cobalt oxide and alumina
    --2 is a kind of pigment
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