illuminant


il·lu·mi·nant

noun \-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

il·lu·mi·nant

noun \-nənt\   (Medical Dictionary)

Medical Definition of ILLUMINANT

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

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