Medical Definition of Leech
Leech: 1. An aquatic parasite that sucks blood from animals. Leeches play a role in medicine today. See: Leech therapy. 2. (Archaic) A physician or surgeon (because they did so much leeching). 3. A person who behaves as a parasite.Source: MedTerms™ Medical Dictionary
Last Editorial Review: 9/14/2016
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