factor ix

noun

1. Christmas factor.

noun Biochemistry.

1. a blood constituent necessary for clotting, the absence of which is characterized by a hemophilialike condition.

n.

1. A factor in the clotting of blood necessary for the formation of intrinsic blood thromboplastin; a deficiency of it causes hemophilia B.antihemophilic globulin B Christmas factor

n.

1. factor IX