Cobalt blue Meaning, Definition & Usage

  1. noun a shade of blue tinged with green
    turquoise; aqua; greenish blue; aquamarine; peacock blue.
  2. noun greenish-blue pigment consisting essentially of cobalt oxide and alumina
    cobalt ultramarine.

WordNet

Definitions
  1. a dark blue pigment consisting of some salt of cobalt, as the phosphate, ignited with alumina; called also cobalt ultramarine, and Thenard's blue.

Webster 1913