(1) an aggregation of blood factors, primarily platelets and fibrin with entrapment of cellular elements, frequently causing vascular obstruction at the point of its formation. The lesion and the syndrome produced by the thrombus depend on its location, e.g. pulmonary artery.
(2) Thrombus: A blood clot in a blood vessel or within the heart. From the Greek thrombos meaning a lump or clump, or a curd or clot of milk.
mural thrombus - one attached to the wall of the endocardium in a diseased area.
obturating thrombus - one which continues to grow distal to its site of attachment and the free end trails downstream with the current of blood.
parietal thrombus - one attached to a vessel or heart wall.