Definition of cerulean blue
1 a
: a variable color averaging a strong greenish blue that is bluer and duller than grotto or cobalt blue and bluer and lighter than indigo carmine
b
: a strong blue that is greener and stronger than Sèvres and greener, lighter, and stronger than Victoria blue — called also
coelin
2
: a stable light greenish blue pigment consisting essentially of oxides of cobalt and tin and used as an artist's color
