Definition of "zygomatic arch" []

• The bony arch in vertebrates that extends along the side or front of the skull beneath the eye socket and that is formed by the zygomatic bone and the zygomatic process of the temporal bone. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The ratios of the breadth of the zygomatic arch (supposing it equal to 100) to the height of the entire face (from the nasion to the gnathion), and to the height of the upper face (from the nasion to the prosthion), give facial indices which are divided by R. Martin into the following groups: (1) Index for the entire face: hypercuryprosopous (to 79.9), curyprosopous (80.0 to 89.9), leptoprosopous (90.0 to 94.9), hyperleptoprosopous (over 95.0)."