"bony arch of the cheek," plural zygomata, 1680s, Modern Latin, from Greek zygoma, from zygon "yoke" (from PIE root *yeug- "to join"). So called because it connects the bones of the face with those of the skull about the ear.
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit yugam "yoke," yunjati "binds, harnesses," yogah "union;" Hittite yugan "yoke;" Greek zygon "yoke," zeugnyanai "to join, unite;" Latin iungere "to join," iugum "yoke;" Old Church Slavonic igo, Old Welsh iou "yoke;" Lithuanian jungas "yoke," jungti "to fasten to a yoke;" Old English geoc "yoke."
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Definitions of zygomatic from WordNet
the arch of bone beneath the eye that forms the prominence of the cheek;
Synonyms: cheekbone / zygomatic bone / malar / malar bone / jugal bone / os zygomaticum