thrombophlebitis Syllabification: (throm·bo·phle·bi·tis)Pronunciation: /ˌTHrämbōfləˈbītis/Definition of thrombophlebitis noun Medicine inflammation of the wall of a vein with associated thrombosis, often occurring in the legs during pregnancy. thrombophlebitis in other Oxford dictionaries Definition of thrombophlebitis in the British & World English dictionary