(pathology) The formation of thrombi in the blood vessels of a living organism, causing obstruction of the circulation.

(cardiology, pathology) Thrombosis of a coronary artery, that is, a blockage, caused by a blood clot, of the blood flow in a coronary artery of the heart, leading to myocardial infarction.

(pathology) Alternative spelling of deep vein thrombosis

(pathology) A potentially fatal condition in which one or more thrombi (or clots) form in the predominantly the leg or, more unusually, the arm. The clot may break free from the venous wall and travel via the circulatory system to the heart or to the lungs (causing a pulmonary embolism); this condition is often caused by keeping the legs bent for long periods but can also be caused by other medical problems.