n. A physician; a medical practitioner; a professor of the art of healing.To treat with medicaments; heal; doctor.n. An aquatic, more or less parasitic, and blood-sucking worm; a suctorial or discophorous annelid of the order Hirudinea.n. Figuratively, one who, as it were, sucks the blood or steals the substance of his victim, or persistently holds on for sordid gain.To apply leeches to, for the purpose of bleeding.n. Nautical, the perpendicular or sloping edge of a sail.n. See leach.