mandible
noun
man·di·ble
ˈman-də-bəl
1
a
: 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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Merriam-Webster unabridged
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