Noun
zygomatic arch (plural zygomatic arches)
(anatomy) An arch formed by the zygomatic process of the temporal bone and the temporal process of the zygomatic bone.
All anapsid skulls lack a temporal opening, while all other extant amniotes have temporal openings (although in mammals the hole has become the zygomatic arch ). Source: Internet
Masseters attach from the dentary (specifically, the masseteric fossa) to the zygomatic arch and onto the maxilla in front of the arch, providing crushing force. Source: Internet
In addition to allowing extra room for the passage of muscles to work the lower jaw, the zygomatic arch also allows for differentiation of separate muscle groups to be involved in biting and chewing. Source: Internet