hemophilia

n. 血友病

he.mo.phil.i.a

n.（名词）
Any of several hereditary blood-coagulation disorders in which the blood fails to clot normally because of a deficiency or an abnormality of one of the clotting factors. Hemophilia, a recessive trait associated with the X-chromosome, is manifested almost exclusively in males.
血友病：遗传性血凝病中的任何一种，由于某个凝血因子的功能丧失或紊乱而造成血液不能正常地凝结成块。作为与Ｘ染色体相关联的隐性性状，血友病几乎全都出现在男性患者身上