haemophilia B

n
Christmas disease, hemophilia II, hemophilioid state C

A hemorrhagic diathesis resulting from a deficiency of plasma thromboplastin component (PTC); transmitted as a sex-linked recessive characteristic and characterized clinically by the same manifestations as classic hemophilia. There is a delay in the generation of thromboplastin. The platelet count, bleeding time, tourniquet test, and thrombin and prothrombin times are normal.

n.

A clotting disorder of blood resembling hemophilia A, caused by hereditary deficiency of factor IX. Also called Christmas disease.

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The noun has one meaning:

Meaning #1: a clotting disorder similar to hemophilia A but caused by a congenital deficiency of factor IX
  Synonyms: hemophilia B, Christmas disease

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