adjective
Definition: Relating to a group of dinosaurs known for their bird-like features, which includes various species that walked on two or four legs.
Example: The ornithischian dinosaurs were known for their unique hip structure and diverse adaptations.
noun
Definition: A type of dinosaur that belongs to the order Ornithischia, characterized by a pelvic structure similar to that of birds and typically herbivorous in nature.
Example: The ornithischian dinosaurs, like the stegosaurus, were known for their unique body structures and herbivorous diets.