cerulean

[suh-roo-lee-uhn]
adjective, noun
1.
deep blue; sky blue; azure.
2.
Heraldry. a sky-blue tincture, used especially on the Continent.

Origin:
1660–70; < Latin caerule(us) dark blue, azure (akin to caelum sky) + -an

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World English Dictionary
cerulean (sɪˈruːlɪən)
 
n
a.  a deep blue colour; azure
 b.  (as adjective): a cerulean sea
 
[C17: from Latin caeruleus, probably from caelum sky]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

cerulean
1667, from L. cæruleus "blue, dark blue, blue-green," probably from cælulum dim. of cælum "heaven, sky," of uncertain origin (see celestial). The L. word was applied by Roman authors to the sky, the Mediterranean, and occasionally to leaves or fields.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Darkening cerulean blue above, a redness along the tree line.
Her eyes are cerulean, her bone structure is extraordinary and she's effortlessly stylish.
Cerulean warblers molt into an adult plumage prior to the breeding season following their hatching year.
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