noun
1.
a. : a permanent greenish blue pigment consisting essentially of cobalt oxide and alumina — called also cobalt ultramarine, King's blue
b. : powder blue
2. : a strong greenish blue that is bluer and deeper than grotto, greener, lighter, and stronger than average cerulean blue (sense 1a), and bluer, lighter, and stronger than indigo carmine — called also cobalt ultramarine, Hungary blue, Leithner's blue, Leyden blue, Olympic blue, Thenard's blue, Venetian blue