Leech

1. A glass tube of peculiar construction, adapted for drawing blood from a scarified part by means of a vacuum.
2. To treat as a surgeon; to doctor; as, to leech wounds.
3. To bleed by the use of leeches.
4. Any one of numerous genera and species of annulose worms, belonging to the order Hirudinea, or Bdelloidea, esp. those species used in medicine, as Hirudo medicinalis of Europe, and allied species.
5. A physician or surgeon; a professor of the art of healing.
6. The border or edge at the side of a sail.