堅けん頭とう竜りゅう

noun

pachycephalosaur

Refers to any dinosaur of the infraorder Pachycephalosauria, known for their thick, domed skulls. Used in paleontological contexts.

• 堅けん頭とう竜りゅうは頭あたまの骨ほねがとても厚あついことで知しられている。

  Pachycephalosaurs are known for having very thick skull bones.