|Also called: coagulation factor any one of a group of substances, including factor VIII, the presence of which in the blood is essential for blood clotting to occur|
|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|clotting factor (klŏt'ĭng) Pronunciation Key
Any of various components of plasma involved in the coagulation of blood, including fibrinogen, prothrombin, and calcium ions. Hereditary deficiency of clotting factors can cause coagulation disorders such as hemophilia.