The Collaborative International Dictionary of English v.0.48:

Bleeder \Bleed"er\, n. (Med.)
      (a) One who, or that which, draws blood.
      (b) One in whom slight wounds give rise to profuse or
          uncontrollable bleeding.
          [1913 Webster]

WordNet (r) 3.0 (2006):

bleeder
    n 1: someone who has hemophilia and is subject to uncontrollable
         bleeding [syn: hemophiliac, haemophiliac, bleeder,
         hemophile, haemophile]