Embolus: A blockage or plug that obstructs a blood 'vessel. Examples of emboli are detached blood clots, clumps of bacteria, and clumps of other foreign material, such as air.

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Embolus: A blockage or plug that obstructs a blood 'vessel. Examples of emboli are detached blood clots, clumps of bacteria, and clumps of other foreign material, such as air.