A plug of some substance lodged in a blood vessel, being brought thither by the blood current. It consists most frequently of a clot of fibrin, a detached shred of a morbid growth, a globule of fat, or a microscopic organism.
Part of a thrombus that has broken free and traveled through the circulation until becoming lodged in a small vessel (and impeding flow). Other types of tissue, such as tumor or fat, and gas (e.g., an air bubble) can also form emboli.
Something that travels through the bloodstream, lodges in a blood vessel and blocks it. Examples of emboli are a detached blood clot, a clump of bacteria , and foreign material such as air. See the entire definition of Embolus