illuminant

[ ih-loo-muh-nuh nt ]
/ ɪˈlu mə nənt /

noun

an illuminating agent or material.

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 forms

non·il·lu·mi·nant, nounun·il·lu·mi·nant, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for illuminant

British Dictionary definitions for illuminant

illuminant

/ (ɪˈluːmɪnənt) /

noun

something that provides or gives off light

adjective

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