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cerulean

[suh-roo-lee-uh n] /səˈru li ən/
adjective, noun
1.
deep blue; sky blue; azure.
2.
Heraldry. a sky-blue tincture, used especially on the Continent.
Origin of cerulean
1660-1670
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. 2015.
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British Dictionary definitions for cerulean

cerulean

/sɪˈruːlɪən/
noun
1.
  1. a deep blue colour; azure
  2. (as adjective): a cerulean sea
Word Origin
C17: from Latin caeruleus, probably from caelum sky
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for cerulean
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.

Online Etymology Dictionary, © 2010 Douglas Harper
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