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Do not confuse leech with leach. Leech means 'a bloodsucking worm' or 'exploit someone' (he’s leeching off the abilities of others), whereas leach means 'remove a substance from soil by the action of water' (the nutrient is quickly leached away).
- 1an aquatic or terrestrial annelid worm with suckers at both ends. Many species are bloodsucking parasites, especially of vertebrates, and others are predators.
- Class Hirudinea: many species. See also medicinal leech
Old English lǣce, lȳce; related to Middle Dutch lake, lieke