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illuminant

American  
[ih-loo-muh-nuhnt] / ɪˈlu mə nənt /

noun

  1. an illuminating illuminating agent or material.


illuminant British  
/ 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

Other Word Forms

  • nonilluminant noun
  • unilluminant adjective

Etymology

Origin of illuminant

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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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

From New York Times • Jan. 29, 2021

Kerosene was the dominant illuminant fuel for a few decades between the decline of whale oil and the rise of electricity.

From Forbes • Oct. 21, 2011

A lamp was banged into the roof of my carriage, half an inch of orange flame, poised in a large glass globe, like a gold-fish, and of about as much use as an illuminant.

From Further Experiences of an Irish R.M. by Ross, Martin

When petroleum began to be used as an illuminant it is impossible to say.

From De Re Metallica, Translated from the First Latin Edition of 1556 by Agricola, Georgius

The street cars moving in the English coast cities must, of course, be lighted and the streets must have some illuminant; but the railroad carriages, hotels, and private houses must draw their curtains.

From The Audacious War by Barron, Clarence W. (Clarence Walker)