Definition of fluorescence in English:


Syllabification: fluo·res·cence
Pronunciation: /flo͝o(ə)ˈresəns, flôrˈesəns


  • 1The 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.
    More example sentences
    • The uralolite exhibits faint green fluorescence in shortwave ultraviolet radiation.
    • Any fluorescence under ultraviolet light may also provide clues to the identity and status of a gemstone.
    • A laboratory technician checked urine for ultraviolet fluorescence indicating the presence of riboflavin.
  • 1.1The property of absorbing light of short wavelength and emitting light of longer wavelength.
    More example sentences
    • Other mutants displayed green fluorescence or lacked fluorescent properties.
    • No particularly strong fluorescence of calcite, especially by comparison with glass, has been noticed.
    • One of the main attractions of chlorophyll fluorescence is that it appears to give a measure of photosynthesis.


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

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