pachycephalosaur Definition

pachycephalosaurus, dinosaur, psittacosaur, ceratosaur, apatosaur, tyrannosaurus rex, megalosaur, maniraptor, tyrannosaurus, thunder lizard, nothosaur, triceratops, marginocephalian, theropod, allosaurus, sauropod, ornithomimid, tyrannosaur, diplodocus, brachiosaurus, woolly mammoth, rhyncholite, stegosaurus, apatosaurus, proboscidean, teleosaur, brontosaurus, edaphosaurus, plesiosaur, maniraptora, iguanodon, amniota, galerite, craniate, titanotherium, cretaceous, sea scorpion, suborder ceratosaura, sordes, oviraptor, paleornithology, hadrosauridae, fossilist, hadrosaur, ceratopsia, surangular, ceratopsian, encrinus, velociraptor, ankylosaurus, archosaur, vertebrate, ornithischian, pterosaur, prototherian, fossil, genus australopithecus, homo erectus, marginocephalia, anthracothere, stegosaur, dryopithecine, fossilology, quadratojugal, dasyurid, metatherian, toxodon, gomphothere, mammal, onychophoran, pterodactyl, anapsid, thyreophora, rhynchonella, chalicothere, suspensorium, dryopithecus, euronithopoda, lituite, genus ankylosaurus, ichthyosaur, trilobite, omomyid, infraorder, encrinite, encrinital, sarcophile, paleozoology, glyptodon, jurassic, iguanodont, dasyure, brush kangaroo, deinonychus, mesozoic era, permian period, thecodont, belemnoid, proostracum, dromaeosaur,