- any herbivorous dinosaur of the order Ornithischia, having a pelvis resembling that of a bird.
- belonging or pertaining to the Ornithischia.
- of, relating to, or belonging to the Ornithischia, an order of dinosaurs that included the ornithopods, stegosaurs, ankylosaurs, and triceratops
- any dinosaur of the order Ornithischia; a bird-hipped dinosaur
