Definition of "mandible"

(anatomy, zootomy)

1. The jaw or a jawbone, especially the lower jawbone in mammals and fishes.  examples

2. Either of the upper and lower segments of a bird's beak.  examples

3. Any of various invertebrate mouthparts serving to hold or bite food materials.

   1. One of the anterior pair of mouthparts of an arthropod, designed for holding and cutting food.  examples