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An embolus is a wandering blood clot.
An embolus is a circulating blood clot.
An embolus is a foreign object, such as a blood clot or bit of tissue or tumor, that is circulating in the blood.
The word root for embolus is "embol-" which means "plug" or "stopper."
Embolic phenomena causes discoloration of the skin from an embolus. The embolus originates from an infected artery. It is a vascular phenomenon.