ornithischia

Noun ornithischia has 1 sense

• ornithischia(n = noun.animal) order ornithischia - extinct terrestrial reptiles having bird-like pelvises: armored dinosaurs (thyreophorans); boneheaded and horned dinosaurs (marginocephalians); duck-billed dinosaurs (euronithopods);
is a kind of animal order
is a member of archosauria, subclass archosauria