Search Result for "illuminant": 
Wordnet 3.0

NOUN (1)

1. something that can serve as a source of light; 



The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]


WordNet (r) 3.0 (2006):

illuminant
    n 1: something that can serve as a source of light