Medical Definition of hemophilia
: a tendency to uncontrollable bleeding; especially : a hereditary, sex-linked blood disorder occurring almost exclusively in males that is marked by delayed clotting of the blood with prolonged or excessive internal or external bleeding after injury or surgery and in severe cases spontaneous bleeding into joints and muscles and that is caused by a deficiency of clotting factors ◆Hemophilia is inherited as an X-linked recessive trait in which the mother must pass on a copy of the defective gene to a male child, and more rarely, both parents must pass on copies of the defective gene to a female child.
Seen and Heard
What made you want to look up hemophilia? Please tell us where you read or heard it (including the quote, if possible).