The Collaborative International Dictionary of English v.0.48:
Urethral \U*re"thral\, a. Of or pertaining to the urethra. [1913 Webster] Urethral fever (Med.), fever occurring as a consequence of operations upon the urethra. [1913 Webster]WordNet (r) 3.0 (2006):
urethral adj 1: of or relating to the urethra