1) Horned dinosaur 2) Ornithischian 3) Ornithischian dinosaur 1) Horneddinosaur 2) Protoceratops 3) Psittacosaur 4) Psittacosaurus 5) Styracosaur 6) Styracosaurus 7) Triceratops 
any of a group of plant-eating dinosaurs from the Cretaceous Period (144 million to 65 million years ago) characterized by a bony frill on the back ... [4 related articles]
[n] - any of several four-footed herbivorous horned dinosaurs with enormous beaked skulls
horned dinosaur noun any of several four-footed herbivorous dinosaurs with enormous beaked skulls; of the late Cretaceous in North America and Mongolia
any of several four-footed, herbivorous dinosaurs of the suborder Ceratopsia, of the late Cretaceous Period, having an enlarged skull with a beak, a large perforated frill at the back, and, in some species, one or three horns. Also called