Fluorescein definitions

flo͝o-rĕs'ē-ĭn, flô-, flō-
An orange-red compound, C20 H12 O5 , that exhibits intense fluorescence in alkaline solution and is used in medicine for diagnostic purposes, in oceanography as a tracer, and as a textile dye.
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A yellowish-red, crystalline compound, C20H12O5, made synthetically from resorcinol and phthalic anhydride: a dilute alkaline solution appears green by reflected light and red by transmitted light: used as a textile dye, a liquid coloring, and, in medicine, an intravenous diagnostic aid.
noun
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An orange-red compound, C20 H12 O5 , that exhibits intense fluorescence in alkaline solution and is used in medicine for diagnostic purposes, in oceanography as a tracer, and as a textile dye.
noun
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An orange-red crystalline compound that exhibits intense fluorescence in alkaline solution. It is used in medicine for diagnostic purposes, in oceanography as a tracer, and as a textile dye. Chemical formula: C20H12O5.
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(chemistry) Any of a class of yellow xanthene dyes which are visible when highly diluted; used forensically to detect traces of blood, and in analytical chemistry as an indicator in silver nitrate titrations.
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Origin of fluorescein

fluoresce +‎ -in