blood clot

Definition / meaning of blood clot

A mass of blood that forms when blood platelets, proteins, and cells stick together. When a blood clot is attached to the wall of a blood vessel, it is called a thrombus. When it moves through the bloodstream and blocks the flow of blood in another part of the body, it is called an embolus.

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Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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