Coagulation is a complex process by which blood forms solid clots. It is an important part of hemostasis (the cessation of blood loss from a damaged vessel) whereby a damaged blood vessel wall is covered by a platelet- and fibrin-containing clot to stop bleeding and begin repair of the damaged vessel. Disorders of coagulation can lead to an increased risk of bleeding and/or clotting and embolism.
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Noun 1. a process in which liquid blood is changed into a semisolid mass (a blood clot) (synonym) blood coagulation (hypernym) curdling, clotting, coagulation