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fluorescence

Definition of fluorescence

noun

[mass noun]
  • the visible or invisible radiation produced from 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.

Origin:

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

fluorescence in other Oxford dictionaries

Definition of fluorescence in the US English dictionary