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fluorescein

or flu·o·res·ce·ine

[ floo-res-ee-in, flaw-, floh- ]

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.


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: C 20 H 12 O 5
“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


fluorescein

/ fl-rĕsē-ĭn,flô- /

  1. 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: C 20 H 12 O 5 .


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Word History and Origins

Origin of fluorescein1

First recorded in 1875–80; fluoresce + -in 2
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Example Sentences

By repeating this process two or three times, the fluorescein may be obtained in a very pure condition.

Fluorescein is readily nitrated, yielding a di- or tetra-nitro compound according to conditions.

If we fill a glass container with a fluorescein solution and look at it by reflected light it appears green.

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fluorescefluorescence