U″ra‐nin (?), n.(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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.