"cerulean" in the noun sense
1. azure, cerulean, sapphire, lazuline, sky-blue
a light shade of blue
"cerulean" in the adjective sense
1. azure, cerulean, sky-blue, bright blue
of a deep somewhat purplish blue color similar to that of a clear October sky
"October's bright blue weather"
Source: WordNet® (An amazing lexical database of English)
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