stegosaurus

noun

1. Any of the clade †Stegosauria of quadruped ornithischian dinosaurs with dorsal plates and spikes, alive during the Jurassic and early Cretaceous periods.
2. Any of the genus †Stegosaurus of herbivorous four-legged armored dinosaurs from the Late Jurassic, characterized by the distinctive kite-shaped upright plates along their backs and spikes on their tails.