thromboembolism Syllabification: (throm·bo·em·bo·lism)Pronunciation: /ˌTHrämbōˈembəˌlizəm/Definition of thromboembolism noun Medicine obstruction of a blood vessel by a blood clot that has become dislodged from another site in the circulation. Derivatives thromboembolicPronunciation: /-ˌemˈbälik/ adjective thromboembolism in other Oxford dictionaries Definition of thromboembolism in the British & World English dictionary