砧骨

砧骨	zhēn gǔ	incus or anvil bone of middle ear, passing sound vibration from malleus hammer bone to stapes stirrup bone
砧	zhēn	anvil
砧	zhēn	variant of 砧
骨	gū	used in 骨碌碌 / used in 骨碌
骨	gǔ	bone