mandible

Etymology

From late Middle English, from Late Latin mandibula (“a jaw”), from mandō (“to chew, masticate”) + -bula (instrument noun suffix).

noun

1. (anatomy, zootomy)
   1. The jaw or a jawbone, especially the lower jawbone in mammals and fishes.
      Coordinate term: maxilla
   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.
      1. One of the anterior pair of mouthparts of an arthropod, designed for holding and cutting food.