Usually means: Dye that glows under light.
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We found 26 dictionaries that define the word fluorescein:

General (18 matching dictionaries)
  1. fluorescein: Merriam-Webster
  2. fluorescein: Oxford Learner's Dictionaries
  3. fluorescein: American Heritage Dictionary of the English Language
  4. fluorescein: Collins English Dictionary
  5. fluorescein: Vocabulary.com
  6. fluorescein: Wordnik
  7. fluorescein: Wiktionary
  8. fluorescein: Webster's New World College Dictionary, 4th Ed.
  9. fluorescein: Infoplease Dictionary
  10. fluorescein: Dictionary.com
  11. Fluorescein (medical use), Fluorescein: Wikipedia, the Free Encyclopedia
  12. Fluorescein: Online Plain Text English Dictionary
  13. fluorescein: Webster's Revised Unabridged, 1913 Edition
  14. fluorescein: Rhymezone
  15. Fluorescein: AllWords.com Multi-Lingual Dictionary
  16. fluorescein: FreeDictionary.org
  17. fluorescein: Mnemonic Dictionary
  18. fluorescein: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. fluorescein: Encyclopedia

Medicine (5 matching dictionaries)
  1. fluorescein: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Medical Dictionary (No longer online)
  4. online medical dictionary (No longer online)
  5. Fluorescein: Medical dictionary

Science (1 matching dictionary)
  1. Drug Discovery and Development (No longer online)

Sports (1 matching dictionary)
  1. CAVE AND KARST TERMINOLOGY (No longer online)

(Note: See fluoresceins as well.)

Definitions from Wiktionary (fluorescein)

noun:  (organic 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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Colors:
    neon yellow,     neon green,     bright yellow,     bright green,     lime green, more...



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