noun
incus; anvil (ear bone)
Anatomical term for the middle ear bone shaped like an anvil. The reading きぬたこつ is standard; ちんこつ is a less common alternative reading.
砧骨は耳小骨の一つで、鼓膜の振動を内耳に伝える。
The incus is one of the auditory ossicles and transmits vibrations from the eardrum to the inner ear.
From 砧 (kinuta, 'fulling block/anvil') + 骨 (kotsu, 'bone'), referring to the anvil-like shape of the incus bone in the middle ear.