fluorescein
Pronunciation: flōr-es′ē-in
Definition: 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.
Synonym(s): resorcinol phthalic anhydride, resorcinolphthalein
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Examples: glitazone, GI cocktail, etc.

