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cerulean

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

1660–70; < Latin caerule(us) dark blue, azure (akin to caelum sky) + -an
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for cerulean

cerulean

noun
    1. a deep blue colour; azure
    2. (as adjective)a cerulean sea
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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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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.

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Online Etymology Dictionary, © 2010 Douglas Harper