Dictionary of Cancer Terms
View in Spanish: Coágulo de sangre
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.
Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.