| uranin | <chemistry> 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. Source: Websters Dictionary (01 Mar 1998) |
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| uraninite | <chemical> A mineral consisting chiefly of uranium oxide with some lead, thorium, etc, occurring in black octahedrons, also in masses with a pitchlike luster; pitchblende. Source: Websters Dictionary (01 Mar 1998) |