• Webster's Revised Unabridged Dictionary
    • n Uranin (Chem) An alkaline salt of fluorescein, obtained as a brownish red substance, which is used as a dye; -- so called from the peculiar yellowish green fluorescence (resembling that of uranium glass) of its solutions. See Fluorescein.
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Century Dictionary and Cyclopedia
    • n uranin The trade-name of the sodium salt of fluorescein or methylfluorescein, the solution of which in water exhibits a magnificent yellowish-green fluorescence like that of uranium glass. The name is also applied to the sodium salt of benzylfluorescein, used as a dyestuff, which is also known as chrysolin.
    • n uranin Same as pitchblende or uraninite. See uraninite.
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In literature:

In some cases the matt varnish may be stained with a little aurine or uranine.
"The Barnet Book of Photography" by Various