ornithischia

1 definition found

ornithischia - WordNet (r) 2.1 (2005) :

  Ornithischia
      n 1: extinct terrestrial reptiles having bird-like pelvises:
           armored dinosaurs (thyreophorans); boneheaded and horned
           dinosaurs (marginocephalians); duck-billed dinosaurs
           (euronithopods) [syn: Ornithischia, order Ornithischia]