方ほう形けい骨こつ

noun

quadrate bone

Anatomical term for a bone in the skull of many vertebrates, including birds, reptiles, and amphibians. In humans, it is a small bone in the middle ear (incus).

See also: 方骨

• 方ほう形けい骨こつは爬は虫ちゅう類るいや鳥ちょう類るいの頭とう蓋がいに見みられる骨ほねである。

  The quadrate bone is a bone found in the skulls of reptiles and birds.