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Leech, annelid (segmented) worm (class Hirudinea) with a prominent attachment sucker at the posterior end and another sucker around the mouth. Leeches are hermaphroditic. Freshwater or semiterrestrial animals, they feed by sucking the blood or other body fluids of mammals, small invertebrates, worms, insect larvae, or snails.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Lange, Dorothea to Lilac