a hereditary disease characterized by an inability of the blood to clot because of a deficiency of a coagulation factor.
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British Dictionary definitions for Christmas disease
a relatively mild type of haemophilia, caused by lack of a protein (Christmas factor) implicated in the process of blood clotting
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012