Definitions for ornithischia
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Princeton's WordNet
Ornithischia, order Ornithischia(noun)
extinct terrestrial reptiles having bird-like pelvises: armored dinosaurs (thyreophorans); boneheaded and horned dinosaurs (marginocephalians); duck-billed dinosaurs (euronithopods)
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"ornithischia." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/ornithischia>.

