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]