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From The Collaborative International Dictionary of English v.0.48:
Uroglaucin \U`ro*glau"cin\, n. [1st uro- + L. glaucus bright.] (Physiol. Chem.) A body identical with indigo blue, occasionally found in the urine in degeneration of the kidneys. It is readily formed by oxidation or decomposition of indican. [1913 Webster]