1) Animal order 2) Order ornithischia 
Ornithischia (ə {respell|or-ni|THISS|kee-ə}) or Predentata is an extinct order of beaked, herbivorous dinosaurs. The name ornithischia is derived from the Greek ornitheos (ορνιθειος) meaning `of a bird` and ischion (ισχιον) meaning `hip joint`. They are known as the `bird-hipped` dinosaurs because of their bird-like hip stru...
[n] - extinct terrestrial reptiles having birdlike pelvises: armored dinosaurs (thyreophorans)
also known as bird hipped dinosaur where the hips closely match that of a bird
order Ornithischia noun extinct terrestrial reptiles having birdlike pelvises: armored dinosaurs (thyreophorans); boneheaded and horned dinosaurs (marginocephalians); duck-billed dinosaurs (euronithopods)