ce·ru·le·an

[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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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
cerulean (sɪˈruːlɪən) [Click for IPA pronunciation guide]
 
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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00:10
Cerulean is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
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.
Cerulean warblers molt into an adult plumage prior to the breeding season following their hatching year.
Her eyes are cerulean, her bone structure is extraordinary and she's effortlessly stylish.
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