cobalt blue

Noun cobalt blue has 2 senses

• cobalt blue(n = noun.attribute) aqua, aquamarine, greenish blue, peacock blue, turquoise - a shade of blue tinged with green;
is a kind of blue, blueness

• cobalt blue(n = noun.substance) cobalt ultramarine - greenish-blue pigment consisting essentially of cobalt oxide and alumina;
is a kind of pigment