‖n. [ NL., fr. Gr. ste`gh roof + say^ros a lizard. ] (Paleon.) A genus of large Jurassic dinosaurs remarkable for a powerful dermal armature of plates and spines. [ 1913 Webster ]
(n) herbivorous ornithischian dinosaur with a row of bony plates along its back and a spiked tail probably used as a weapon, Syn. Stegosaur stenops, stegosaurus