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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
http://www.medterms.com/script/main/art.asp?articlekey=24573
Last Editorial Review: 10/9/2012

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