the world > animals > animal body > general parts > constituent materials > [noun] > bone joining skull and jaw (3)
Zoology. In non-mammalian vertebrates: a bone forming the posterior part of the lower jaw, articulating with the quadrate bone.
Zoology (now chiefly historical). A mesopterygoid bone.
The bone, or series of bones, cartilages, etc., by which the lower jaw is suspended from the skull in vertebrates below mammals.