Ornithischia

1 definition found

From WordNet (r) 2.0 [wn]:

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