Dictionary

illuminant

noun il·lu·mi·nant \-nənt\

Definition of ILLUMINANT

:  an illuminating device or substance

Examples of ILLUMINANT

  1. <at the time, a spermaceti candle was the brightest indoor illuminant available>

First Known Use of ILLUMINANT

1644
Medical Dictionary

illuminant

noun il·lu·mi·nant \-nənt\

Medical Definition of ILLUMINANT

:  an illuminating device or substance (as for a microscope)

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stringent Hear it
rigorous, strict, or severe
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