Noun: Ornithischia
- Extinct terrestrial reptiles having bird-like pelvises: armoured dinosaurs (thyreophorans); boneheaded and horned dinosaurs (marginocephalians); duck-billed dinosaurs (euronithopods)
- order Ornithischia
Type of: animal order
Part of: Archosauria, subclass Archosauria
Encyclopedia: Ornithischia