The Collaborative International Dictionary of English v.0.48:

Leech \Leech\, v. t. [imp. & p. p. Leeched (l[=e]cht); p. pr.
   & vb. n. Leeching.]
   1. To treat as a surgeon; to doctor; as, to leech wounds.
      [Archaic]
      [1913 Webster]

   2. To bleed by the use of leeches.
      [1913 Webster]