Original: Maerz and Paul A Dictionary of Color New York:1930 McGraw-Hill Page 190; Color Sample of Cerulean: Page 89 Plate 33 Color Sample E6 The word is probably derived from the Latin word caeruleus, "dark blue, blue or blue-green", which in turn probably derives from caelulum, diminutive of caelum, "heaven, sky".
Simplified: Maerz and Paul A Dictionary of Color New York:1930 McGraw-Hill Page 190; Color Sample of Cerulean: Page 89 Plate 33 Color Sample E6 Meaning of cerulean Cerulean represents the "sky" or "heavens", or sometimes the ocean.