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   fluo·res·cence

   /flo͝oˈres(ə)ns/

   noun

   • 1. the visible or invisible radiation emitted by certain substances as a result of incident radiation of a shorter wavelength such as X-rays or ultraviolet light.
   • ▪ the property of absorbing light of short wavelength and emitting light of longer wavelength.

   Word Origin mid 19th century: from fluorspar (which fluoresces), on the pattern of opalescence.

   Scrabble Points: 19

   • F

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   • L

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   • N

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