pachycephalosaur

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pach·y·ceph·a·lo·saur

 (păk′ĭ-sĕf′ə-lə-sôr′)
[From New Latin Pachycephalosaurus, genus name; see pachycephalosaurus.]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.pachycephalosaur - bipedal herbivore having 10 inches of bone atop its headpachycephalosaur - bipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found
bone-headed dinosaur - bipedal herbivorous dinosaurs with bony crowns