名詞 cerulean:

1. a light shade of blue
   同義詞：azure, sapphire, lazuline, sky-blue

形容詞 cerulean:

1. of a deep somewhat purplish blue color similar to that of a clear October sky
   同義詞：azure, sky-blue, bright blue

ce.ru.le.an

adj.Color （形容詞）【色彩】
Azure; sky-blue.
蔚藍色的；天藍色的

來源：
From Latin caeruleus [dark blue] ; akin to caelum [sky]
源自 拉丁語 caeruleus [暗藍的] ；類似于 caelum [天空]