The Collaborative International Dictionary of English v.0.48:

Urology \U*rol"o*gy\, n. [1st uro- + -logy.] (Med.)
   See Uronology.
   [1913 Webster]

WordNet (r) 3.0 (2006):

urology
    n 1: the branch of medicine that deals with the diagnosis and
         treatment of disorders of the urinary tract or urogenital
         system [syn: urology, urogenital medicine]