| pachycephalosaur | (n) bipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found, Syn. pachycephalosaurus |
| suborder pachycephalosaurus | (n) boneheaded dinosaurs; late Cretaceous |
| パキケファロサウルス | [pakikefarosaurusu] (n) pachycephalosaurus [Add to Longdo] |
| 堅頭竜 | [けんとうりゅう, kentouryuu] (n) pachycephalosaur (any dinosaur of infraorder Pachycephalosauria) [Add to Longdo] |