what is thromboembolism
1 Thromboembolism: Lodgement of a blood clot causing blockage. 2  Thromboembolism: Obstruction of a vessel by a blood clot that has been transported from a distant site by the blood stream. Source - Diseases Database.  Thromboembolism: occlusion of a blood vessel by an embolus that has broken away from a thrombus.