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illuminant

[ ih-loo-muh-nuhnt ]

noun

  1. an illuminating illuminating agent or material.


illuminant

/ ɪˈluːmɪnənt /

noun

  1. something that provides or gives off light
“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

adjective

  1. giving off light; illuminating
“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
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Other Words From

  • nonil·lumi·nant noun
  • unil·lumi·nant adjective
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Word History and Origins

Origin of illuminant1

1635–45; < Latin illūminant- (stem of illūmināns ) present participle of illūmināre to light up, brighten, equivalent to illūmin- ( illumine ) + -ant- -ant
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Example Sentences

A fixture even more than a star, either way an illuminant.

Lighthouse illuminants changed dramatically over time, running the gamut from whale, lard and vegetable oil to kerosene, acetylene and finally electricity.

From Time

The airy, brick-lined museum calls attention to their historic magnitude, feats of engineering and the inventors who perfected illuminants and optics.

This lovely illuminant contrivance is perhaps symbolic of that golden age.”

From Forbes

If the gilds forbade the carrying on of a craft by night, it was because the dim gloom of ancient illuminants meant bad work, and not because protracted toil made unhealthy workmen.

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