I. adjective
also cae·ru·lean sə̇ˈrülēən, sē-, -lyən
Etymology: Latin caeruleus dark blue (probably from caelum sky) + English -an — more at celestial
1. : somewhat resembling the blue of the sky
2. : of the color sky blue
II. noun
( -s )
: the color of the sky on a bright cloudless day : deep blue or azure