an inflammation of the urethra that is spread by sexual contact, having symptoms similar to gonorrhea but caused by organisms (esp. Chlamydia trachomatis) other than the gonococcus
See nongonococcal urethritis in American Heritage Dictionary 4
(nŏnˌgŏn-ə-kŏkˈəl)
noun Abbr. NGU
An inflammation of the urethra similar to that of gonorrhea but caused by the rickettsia Chlamydia trachomatis and occurring mostly among males as an early symptom of chlamydia.