ceratopsian - any of several four-footed herbivorous horned dinosaurs with enormous beaked skulls; of the late Cretaceous in North America and Mongoliatriceratops - huge ceratopsian dinosaur having three horns and the neck heavily armored with a very solid frill styracosaur, styracosaurus - an unusual ceratopsian dinosaur having many large spikes around the edge of its bony frill and a long nose horn; late Cretaceous psittacosaur, psittacosaurus - primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind and short front limbs; may have been bipedal |