Either of the upper and lower segments of a bird's beak.
Any of various invertebrate mouthparts serving to hold or bite food materials.
One of the anterior pair of mouthparts of an arthropod, designed for holding and cutting food.
The jaw or a jawbone, especially the lower jawbone in mammals and fishes.
A chin-like projection below the mouth of certain mollusks.
The central part of the labium in insects.
A projection in front of the flower in some orchids.
The chin.