• synonyms


[ih-loo-muh-nuh nt]
  1. an illuminating agent or material.
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Origin of illuminant

1635–45; < Latin illūminant- (stem of illūmināns) present participle of illūmināre to light up, brighten, equivalent to illūmin- (see illumine) + -ant- -ant
Related formsnon·il·lu·mi·nant, nounun·il·lu·mi·nant, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for illuminant

Historical Examples

  • It came as an invading enemy and not as an illuminant to all.

    Evolution of Life and Form

    Annie Wood Besant

  • The illuminant is oil gas, with an occulting characteristic.

  • Nevertheless, the electric light is the illuminant to be coveted.

    The Turkish Bath

    Robert Owen Allsop

  • It is largely used as an illuminant and for the production of great heat.

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

    De Re Metallica

    Georgius Agricola

British Dictionary definitions for illuminant


  1. something that provides or gives off light
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  1. giving off light; illuminating
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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