an illuminating agent or material.
- non·il·lu·mi·nant, noun
- un·il·lu·mi·nant, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use illuminant in a sentence
As time passed, and the new illuminant was backward in appearing, the shares recovered their old value.Heroes of the Telegraph | J. Munro
The general illuminant is electricity, and both electrical and gas services are owned by the municipality.
So that, light for light, acetylene fouls the air less than any ordinary illuminant excepting the Welsbach gas burner.
Owing to the lack of a good illuminant the bulk of the people retire with the fowls and rise with the sun.Wisconsin in Story and Song; | Various
Acetylene gives a light which is nearest to sunlight of any artificial illuminant.Oxy-Acetylene Welding and Cutting | Harold P. Manly
British Dictionary definitions for illuminant
something that provides or gives off light
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