A type of worm that is known for sucking blood from other animals, often used in medical treatments to draw blood. The doctor used a leech to help reduce the swelling in the patient's leg.
A person who extorts profit from or sponges on others; a parasite. He was considered a leech by his friends because he always borrowed money and never paid it back.
The trailing edge of a sail, especially the portion between the head and the clew. The leech of the mainsail needed reinforcing before the voyage.
(Archaic) A physician or healer. The village leech concocted an herbal remedy for the feverish child.