illuminant

noun il·lu·mi·nant \ i-ˈlü-mə-nənt \

Definition of illuminant

: an illuminating device or substance

Examples of illuminant in a Sentence

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

First Known Use of illuminant

1644

in the meaning defined above

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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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