urethritis UK /ˌjʊəɹɪˈθɹaɪtɪs/US /ˌjʊɹəˈθɹaɪtɪs/ noun1 •Inflammation of the urethra, a finding possible in many diseases (e.g., STI and non-STI, including UTI) but often in gonorrhea and chlamydia. formsurethrites · urethritides