Definition: ornithischia

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Source: WordNet (r) 1.7 

Ornithischia
     n : extinct terrestrial reptiles having birdlike pelvises:
         armored dinosaurs (thyreophorans); bone-headed and horned
         dinosaurs (marginocephalians); duck-billed dinosaurs
         (euronithopods) [syn: Ornithischia, order Ornithischia]