Definition of mandible
1a : jaw sense 1a especially : a lower jaw consisting of a single bone or of completely fused bones
b : the lower jaw with its investing soft parts
c : either the upper or lower segment of the bill of a bird
2 : any of various invertebrate mouthparts serving to hold or bite food materials especially : either member of the anterior pair of mouth appendages of an arthropod often forming strong biting jaws
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