Webster's English Dictionary

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mandible

man.di.ble \'man-d*-b*l\ \man-'dib-y*-l*t\ \-.ler-e-\ \-l*t\ n [MF, fr. LL 
   mandibula, fr. L mandere to chew - more at MOUTHM 1a: JAW; esp : a lower 
   jaw consisting of a single bone or com pletely fused bones 1b: the lower 
   jaw with its investing soft parts  1c: either the upper or lower segment of 
   the bill of a bird  2: any of various invertebrate mouthparts serving to 
   hold or bite food mate rials; esp : either member of the anterior pair of 
   mouth appendages of an arthropod often forming strong biting jaws - 
   man.dib.u.lar aj