from
WordNet (r) 3.0 (2006)
fluorescein
n 1: 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)
[syn: {fluorescein}, {fluoresceine}, {fluorescent dye},
{resorcinolphthalein}]
from
The Collaborative International Dictionary of English v.0.48
fluorescein \fluo`res"ce*in\, fluoresceine \fluo`res"ce*ine\,
fluorescein \flu`o*res"ce*["i]n\, n. (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}.
Syn: fluorescein, fluorescent dye, resorcinolphthalein.
[1913 Webster]