christmas disease definition
Definition of âChristmas diseaseâ - English Dictionary. See all translations. uk â /ËkrÉªs.mÉs dÉªËziËz/ us â /ËkrÉªs.mÉs dÉªËziËz/ specialized. âº also haemophilia B a genetic disease in which there is not enough of a substance called factor IX in the blood, so that the person cannot stop bleeding after an injury. (Definition of âChristmas diseaseâ from the Cambridge Advanced Learner's Dictionary & Thesaurus Â© Cambridge University Press)