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fluorescein

[floo-res-ee-in, flaw-, floh-] /flʊˈrɛs i ɪn, flɔ-, floʊ-/
noun, Chemistry
1.
an orange-red, crystalline, water-insoluble solid, C 20 H 12 O 5 , that in alkaline solutions produces an orange color and an intense green fluorescence: used to trace subterranean waters and in dyes.
Also, fluoresceine.
Also called resorcinolphthalein.
Origin
1875-1880
1875-80; fluoresce + -in2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for fluorescein
  • The use of fluorescein angiography in acquired macular diseases.
  • The movement of fluorescein dye in durum and soft wheat kernels was investigated during the wheat tempering process.
British Dictionary definitions for fluorescein

fluorescein

/ˌflʊəˈrɛsɪɪn/
noun
1.
an orange-red crystalline compound that in aqueous solution exhibits a greenish-yellow fluorescence in reflected light and is reddish-orange in transmitted light: used as a marker in sea water and as an indicator. Formula: C20H12O5
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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fluorescein in Medicine

fluorescein fluo·res·ce·in (flu-rěs'ē-ĭn, flô-)
n.
An orange-red compound that exhibits intense fluorescence in alkaline solution and is used in ophthalmology to reveal corneal lesions.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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fluorescein in Science
fluorescein
  (fl-rěs'ē-ĭn, flô-)   
An orange-red crystalline compound that exhibits intense fluorescence in alkaline solution. It is used in medicine for diagnostic purposes, in oceanography as a tracer, and as a textile dye. Chemical formula: C20H12O5.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for fluorescein

organic compound of molecular formula C20H12O5 that has wide use as a synthetic colouring agent. It is prepared by heating phthalic anhydride and resorcinol over a zinc catalyst, and it crystallizes as a deep red powder with a melting point in the range of 314 to 316 C (597 to 601 F). Fluorescein was named for the intense green fluorescence it imparts to alkaline solutions-a colour visible even at dilutions of 1:50,000,000. It is used as a dye to colour liquids in analytic instruments, in cosmetics, and as a water tracer or marker. Halogenated derivatives made from fluorescein also include eosin and erythrosin.

Learn more about fluorescein with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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