• WordNet 3.6
    • n fluoresceine 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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Webster's Revised Unabridged Dictionary
    • n fluoresceine (Chem) 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.
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In literature:

By repeating this process two or three times, the fluorescein may be obtained in a very pure condition.
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5" by Various
Are you familiar with fluorescein?
"Astounding Stories of Super-Science January 1930" by Victor Rousseau

In news:

Fluorescein may stain damaged cells.
We did a study showing that lissamine green staining typically will stain one grade lower compared to fluorescein staining on the conjunctiva (Hom, ARVO 2008 #5298/D740).
With fluorescein stain , we can use a yellow filter to enhance our viewing.
Feenstra and Tseng (1992) showed that fluorescein doesn't stain healthy cells, has no intrinsic toxicity and shows increased staining in dead cells.

In science:

Noncovalent functionalization of carbon nanotubes by fluorescein-polyethylene glycol: Supramolecular conjugates with pH-dependent absorbance and fluorescence. J.
Carbon Nanotubes in Biology and Medicine: in vitro and in vivo Detection, Imaging and Drug Delivery