Ceratosaurus was a large theropod. The original specimen is estimated to be 5.69 m (18.7 ft) long, while the referred specimen described as Ceratosaurus dentisulcatus was larger, at around 7 m (23 ft) long. Ceratosaurus was characterized by deep jaws that supported proportionally very long, blade-like teeth, a prominent, ridge-like horn on the midline of the snout and a pair of hornlike ridges over the eyes. The forelimbs were very short but remained fully functional; the hand possessed four fingers.