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A type of hemophilia that is caused by a deficiency of factor IX.
[After Stephen Christmas, 20th-century British boy who was first diagnosed with it.]
(Pathology) a relatively mild type of haemophilia, caused by lack of a protein (Christmas factor) implicated in the process of blood clotting
[C20: named after S. Christmas, the first patient suffering from the disease who was examined in detail]
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|Noun||1.||Christmas disease - a clotting disorder similar to hemophilia A but caused by a congenital deficiency of factor IX|