zy·go·ma (zī-gōmə, zĭ-)
n. pl. zy·go·ma·ta (-mə-tə) or zy·go·mas
1. The zygomatic bone.
2. The zygomatic arch.
3. The zygomatic process.
[New Latin zygōma, zygōmat-, from Greek zugōma, bolt, from zugoun, to join; see yeug- in the Appendix of Indo-European roots.]
zy′go·matic (-mătĭk) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.