Fluorescein

ahd-5
  • noun. An orange-red compound, C20H12O5, 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.
    • The Century Dictionary and Cyclopedia
  • noun. The anhydrid of resorcin phthalein, C20H12O5. It is a coal-tar product, but is little used in dyeing. From it are derived the eosins.
    • the GNU version of the Collaborative International Dictionary of English
  • noun. A yellowish red, crystalline substance, C20H12O5, produced by heating together phthalic anhydride and resorcin; -- so called, from the very brilliant yellowish green fluorescence of its alkaline solutions. It has acid properties, and its salts of the alkalies are known to the trade under the name of uranin.
    • Wiktionary, Creative Commons Attribution/Share-Alike License
  • noun. 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
    • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • noun. 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)
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