What term is defined by a plug or clot in a blood vessel formed by the coagulation of blood?

The term that refers to a plug or clot in a blood vessel formed by the coagulation of blood is "thrombus." A thrombus is a solid mass of platelets, fibrin, and blood cells that forms at the site of a blood vessel injury or within the vessel due to various factors such as stagnation of blood flow or hypercoagulable states.

In contrast to an embolus, which is a thrombus or other material that has broken free and travels through the bloodstream to lodge in another vessel, a thrombus remains anchored at its original site. Understanding this distinction is vital in medical contexts because it relates to different potential complications and treatments, such as clot management and the risk of embolism.

Other options, while related to blood and coagulation processes, do not specifically define a clot that remains at the site of its formation in the same way that "thrombus" does.