mandible

noun4

1. •
   The jaw or a jawbone, especially the lower jawbone in mammals and fishes.
2. •
   Either of the upper and lower segments of a bird's beak.
3. •
   Any of various invertebrate mouthparts serving to hold or bite food materials.
4. •
   One of the anterior pair of mouthparts of an arthropod, designed for holding and cutting food.