An orange-red crystalline powder that yields a bright green fluorescence in solution, and is reduced to fluorescin; a nontoxic, water-soluble indicator used diagnostically to trace water flow. SYN: resorcinol phthalic anhydride, resorcinolphthalein.
- f. sodium a dye used for diagnosis of certain ocular diseases, differentiation or delineation of organ parts in surgery, and determination of circulation time. SYN: resorcinolphthalein sodium, uranin.
* * *
flu·o·res·ce·in -'es-ē-ən n a yellow or red crystalline dye C20H12O5 with a bright yellow-green fluorescence in alkaline solution that is used as the sodium salt as an aid in diagnosis (as of lesions and foreign bodies in the cornea or of brain tumors)
* * *
flu·o·res·ce·in (fl
-resґēn) [USP] the simplest of the fluorane dyes and the parent compound of eosin; used as a diagnostic indicator in assessing corneal trauma and fitting contact lenses.
Fluorescein staining of an area of ulceration in progressive circumferential peripheral corneal ulceration.
Medical dictionary. 2011.