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Definition of: mandible
(man′də·bəl) noun Biol.
1. The lower jaw bone, or its equivalent.
2. Either the upper or the lower part of the beak of a bird, or of the beak of a cephalopod.
3. Either one of the upper or outer pair of jaws in an insect.
4. The operculum of a polyzoan. [<LL mandibula jaw <L mandere chew]
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