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 WordNet Dictionary |  
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|   | Definition: |   | [n]  extinct terrestrial reptiles having birdlike pelvises: armored dinosaurs (thyreophorans); bone-headed and horned dinosaurs (marginocephalians); duck-billed dinosaurs (euronithopods)   |  
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|   | Synonyms: |   | Ornithischia |  
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|   | See Also: |   | animal order, Archosauria, euronithopod, Euronithopoda, genus Pisanosaurus, genus Staurikosaurus, Marginocephalia, marginocephalian, ornithischian, ornithischian dinosaur, Ornithopoda, subclass Archosauria, suborder Euronithopoda, suborder Marginocephalia, suborder Ornithopoda, suborder Thyreophora, Thyreophora, thyreophoran |       |  
 
  
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