方ほう骨こつ

noun

quadrate bone

Anatomical term for a bone in the skull of most vertebrates except mammals; in humans it is part of the incus.

• 爬は虫ちゅう類るいや鳥ちょう類るいでは、方ほう骨こつが下か顎がくと頭とう蓋がいをつないでいる。

  In reptiles and birds, the quadrate bone connects the lower jaw to the skull.