uranin

from The Century Dictionary.

• noun 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.
• noun Same as pitchblende or uraninite. See uraninite.

from the GNU version of the Collaborative International Dictionary of English.

• noun (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun chemistry An alkaline salt of fluorescein, used as a brownish-red dye.