factor IX

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Related to plasma thromboplastin factor B: plasma thromboplastin antecedent, plasma thromboplastin component

factor IX

n.
A protein substance in blood plasma that is essential for the clotting of blood. A deficiency of this factor is the cause of Christmas disease.
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Noun1.factor IX - coagulation factor whose absence is associated with hemophilia B
clotting factor, coagulation factor - any of the factors in the blood whose actions are essential for blood coagulation
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