genus of large, plant-eating ornithischian dinosaurs of the Late Cretaceous Epoch (99–65 million years ago).
Triceratops had a very long skull (some more than 6 ft [1.8 m] long); a large bony frill about the neck; a relatively short, pointed horn on the nose; a beaklike mouth; and two pointed horns, more than 3.3 ft (1 m) long, above the eyes. Adults weighed 4–5 tons (3.6–4.5 metric tons) and grew up to 30 ft (9 m) long. The limbs were very stout, and the hind limbs were more massive than the forelimbs.