(n) a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed), Syn.resorcinolphthalein, fluoresceine, fluorescent dye
The Collaborative International Dictionary of English (GCIDE) v.0.53
n. [ Iso- + orcin. ] (Chem.) A crystalline hydrocarbon derivative, metameric with orcin, but produced artificially; -- called also cresorcin. [ 1913 Webster ]
n. [ Resin + orcin. So called because in its higher homologue it resembles orcin. ] (Chem.) A colorless crystalline substance of the phenol series, obtained by melting certain resins, as galbanum, asafetida, etc., with caustic potash. It is also produced artificially and used in making certain dyestuffs, as phthalein, fluorescein, and eosin. [ 1913 Webster ]
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