pachycephalosaur

pachycephalosaur
pach·y·ceph·a·lo·saur (păk'ĭ-sĕfʹə-lə-sôr') n.
Any of various medium-sized herbivorous dinosaurs of the genus Pachycephalosaurus of the late Cretaceous period of North America, having a beaked mouth, rows of bumps on the head, and a domed skull up to ten inches (25.4 cm) thick.
  [New Latin Pachycephalosaurus, genus name : Greek pakhus, thick + Greek kephalē, head; See ghebh-el- in Indo-European Roots + Greek sauros, lizard.]

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