- an illuminating agent or material.
Origin of illuminant
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for illuminant
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
- something that provides or gives off light
- giving off light; illuminating