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English word cerulean comes from Latin caelum ((vault of) heaven. Atmosphere, climate, weather. Sky.), Proto-Indo-European *ḱyē(w)-
caelum (Latin)
(vault of) heaven. Atmosphere, climate, weather. Sky.
*ḱyē(w)- (Proto-Indo-European)
grey, grey, dark
caeruleus (Latin)
Of or pertaining to rivers or sea and river deities.. Of or pertaining to the sea.. Of or pertaining to the sky.. Dark colored, dark blue, dark green, cerulean, azure. Gloomy, sable, black.
cerulean (English)
(countable) A butterfly of the family Lycaenidae.. (countable, and, uncountable) A greenish-blue color. Sky-blue.