illuminant

[ih-loo-muh-nuhnt]

il·lu·mi·nant

[ih-loo-muh-nuhnt]
noun
an illuminating agent or material.

Origin:
1635–45; < Latin illūminant- (stem of illūmināns) present participle of illūmināre to light up, brighten, equivalent to illūmin- (see illumine) + -ant- -ant

non·il·lu·mi·nant, noun
un·il·lu·mi·nant, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Illuminant is always a great word to know.
So is callithumpian. Does it mean:
a chattering or flighty, light-headed person.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
World English Dictionary
illuminant (ɪˈluːmɪnənt)
 
n
1.  something that provides or gives off light
 
adj
2.  giving off light; illuminating

Collins English Dictionary - Complete & Unabridged 10th Edition
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