Definitions for pachycephalosaurus
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Princeton's WordNet
pachycephalosaur, pachycephalosaurus(noun)
bipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found
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"pachycephalosaurus." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/pachycephalosaurus>.

