suborder Pachycephalosaurus


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Noun1.suborder Pachycephalosaurus - boneheaded dinosaurs; late Cretaceous
animal order - the order of animals
Marginocephalia, marginocephalian, suborder Marginocephalia - includes boneheaded (pachycephalosaurs) and horned (ceratopsian) dinosaurs
bone-headed dinosaur - bipedal herbivorous dinosaurs with bony crowns