Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Something that gives off light.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Something that illuminates.

from the GNU version of the Collaborative International Dictionary of English

  • n. That which illuminates or affords light.

from The Century Dictionary and Cyclopedia

  • Pertaining to illumination; affording light.
  • n. That which illuminates or affords light; a material from which light is procured.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. something that can serve as a source of light

Etymologies

Latin illūmināns, illūminant-, present participle of illūmināre, to illuminate; see illuminate.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From French (Wiktionary)

Examples

  • Rockefellers as soon as the sun goes down, no matter what form of illuminant they use.

    Chapter 9: The Mathematics of a Dream

  • I had a dream last night it was the illuminant who was stirring all this controversy over the health care bill ........

    Baucus could send proposal to 'Gang of Six' on Saturday

  • What Don said is, I think, perfectly correct when talking about saturation, my point was just that Jim wasn't talking about saturation but about chroma, and not about emmited lights but about reflective surfaces under a given illuminant, so, in my view, Don was correct but beyond the point.

    Peak Saturation Value

  • If you have a surface that reflects only in the yellow wavelength, it will seem rather dark for it wastes most of the illuminant, and, by seeming dark, it will have low chroma so you'll end up with that sort of brown or greenish thingy that you can see in Gurney's low chroma yellow, in the post.

    Peak Saturation Value

  • With a flash of intuition, Bissell had the idea that it could be used as an illuminant.

    The Pennsylvania Start-up That Changed The World

  • As the population grows, the demand for illuminant should grow at least as quickly.

    Coyote Blog » Blog Archive » Someone Else Joins the “Peak Whale” Bandwaggon

  • The group thought that the rock oil could be exploited in far larger quantities and processed into a fluid that could be burned as an illuminant in lamps.

    The Prize

  • This new illuminant, they were sure, would be highly competitive with the “coal-oils” that were winning markets in the 1850s.

    The Prize

  • Seeing the rock oil sample at Dartmouth, he conceived, in a flash, that it could be used not as a medicine but as an illuminant—and that it might well assuage the woes of his pocketbook.

    The Prize

  • But could the rock oil really be used as an illuminant?

    The Prize

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