Hypertext Webster Gateway: "illuminant"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Illuminant \Il*lu"mi*nant\, n. [L. illuminans, -antis, p. pr. of
illuminare.]
That which illuminates or affords light; as, gas and
petroleum are illuminants. --Boyle.
From WordNet (r) 1.7 (wn)
illuminant
n : something that can serve as a source of light
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