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Noun: Christmas disease  'kris-mus di'zeez
  1. A clotting disorder similar to haemophilia A but caused by a congenital deficiency of factor IX
    - hemophilia B [N. Amer], haemophilia B [Brit, Cdn]

Type of: bleeder's disease, haemophilia [Brit, Cdn], hemophilia [N. Amer]

Encyclopedia: Christmas disease