factor IX
noun
\ -ˈnīn
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Definition of factor IX
: a clotting factor that activates factor VIII and whose deficiency is associated with hemophilia
— called also Christmas factor
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More Definitions for factor IX
factor IX
noun
\ -ˈnīn
\
\
Medical Definition of factor IX
: a clotting factor that activates factor VIII and whose absence is associated with hemophilia B
— called also autoprothrombin II, Christmas factor