■ noun a form of haemophilia caused by deficiency of a blood-clotting factor (Factor IX) different from the one usually implicated in the disease.
Origin
1950s: Christmas , from the surname of the first patient studied.
■ noun a form of haemophilia caused by deficiency of a blood-clotting factor (Factor IX) different from the one usually implicated in the disease.
Origin
1950s: Christmas , from the surname of the first patient studied.
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004