The zygomatic bone is in the human skull. The body part starting with x would be the xiphoid process.
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optic nervequadricepsxiphoid processyellow marrowzygomatic bone
yellow marrow
Yellow bone or marrow
All I can think of is yellow marrow and the Y chromosoze.
Xiphoid process, yellow marrow and the zonule of Zinn (part of the eye) are body parts.