Source : Webster's Revised Unabridged Dictionary (1913)

Bloodsucker \Blood"suck`er\, n.
   1. (Zo["o]l.) Any animal that sucks blood; esp., the leech
      ({Hirudo medicinalis}), and related species.

   2. One who sheds blood; a cruel, bloodthirsty man; one guilty
      of bloodshed; a murderer. [Obs.] --Shak.

   3. A hard and exacting master, landlord, or money lender; an
      extortioner.

Source : WordNet®

bloodsucker
     n : carnivorous or bloodsucking aquatic or terrestrial worms
         typically having a sucker at each end [syn: {leech}, {hirudinean}]