Cerulean, also spelled caerulean, is a color term that may be applied to certain colors with the hue ranging roughly between blue and cyan, overlapping with both. It also largely overlaps with azure and sky blue, although cerulean is dimmer.
The first recorded use of cerulean as a color name in English was in 1590. The word is derived from the Latin word caeruleus, “dark blue, blue or blue-green”, which in turn probably derives from caerulum, diminutive of caelum, “heaven, sky”. Crayola produced this colour from 1949–1958.