Cerulean


deep blue; sky blue; azure.
Heraldry. a sky-blue tincture, used especially on the Continent.
noun

a deep blue colour; azure
(as adjective): a cerulean sea

adj.

1660s, with -an + Latin caeruleus “blue, dark blue, blue-green,” perhaps dissimilated from caelulum, diminutive of caelum “heaven, sky,” of uncertain origin (see celestial). The Latin word was applied by Roman authors to the sky, the Mediterranean, and occasionally to leaves or fields. As a noun, from 1756.

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