Definition of fluorescein in English:


Syllabification: fluo·res·ce·in
Pronunciation: /flo͝o(ə)ˈresēən, flôrˈesēən


  • An orange dye with a yellowish-green fluorescence, used as an indicator and tracer.
    • A derivative of resorcinol and phthalic anhydride; chemical formula: C20H12O5
    More example sentences
    • To this purpose we have considered four dyes, namely: indo - 1, rhodamine 6G, fluorescein, and pyrene.
    • Quinine bisulfate was used as the standard for the bisbenzimide dyes, for PIH and ethidium bromide the standard used was rhodamine 101 and fluorescein was used for the cyanine dyes.
    • Anole splenocytes were phagocytically active and produced copious amounts of nitric oxide following exposure to fluorescein labeled E. coli bioparticles.


late 19th century: from fluorescence + -in1.

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a slit made by cutting with a saw