I saw the term 'zygomatic bone' in an anatomy textbook.
The zygomatic bone is part of the facial skeleton.
Rare kanji spelling for the anatomical term 'cheekbone'. The reading けんこつ is also listed but is less common.
From Chinese 顴骨 (quángǔ), meaning cheekbone. The kanji 顴 is rare in Japanese and specific to this anatomical term.