- noun (written as deep vein thrombosis)a potentially fatal condition in which a blood clot forms in a vein or artery and may partially or completely block blood flow. It is often the result of long periods of immobility.
- noun a condition arising when a thrombus formed in the deep veins of a leg or the pelvis travels to a lung where it may cause death. The condition may affect anyone who is inactive for long periods.
- noun coagulated blood in the deep veins of a leg or the pelvis.