A clot formed from platelets and other elements; that forms in a blood vessel in a living organism, and causes thrombosis or obstruction of the vessel at its point of formation or travel to other areas of the body.
Any of the coronary vessels; a coronary artery or coronary vein.
A small bone in the foot of a horse.
Encircling something (like a crown), especially with regard to the arteries or veins of the heart.