non·gon·o·coc·cal urethritis 
(nŏn′gŏn-ə-kŏkəl)
(nŏn′gŏn-ə-kŏkəl)n. Abbr. NGU
An inflammation of the urethra similar to that of gonorrhea but caused by the bacterium Chlamydia trachomatis and occurring mostly among males as an early symptom of chlamydia.