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From The Collaborative International Dictionary of English v.0.48:
Zygomatic \Zyg`o*mat"ic\ (?; 277), a. [Cf. F. zygomatique.] (Anat.) Of, pertaining to, or in the region of, the zygoma. [1913 Webster] Zygomatic arch, the arch of bone beneath the orbit, formed in most mammals by the union of the malar, or jugal, with the zygomatic process of the temporal bone. In the lower vertebrates other bones may help to form it, and there may be two arches on each side of the skull, as in some reptiles. Zygomatic process, a process of the temporal or squamosal bone helping to form the zygomatic arch. [1913 Webster] Zygomorphic