a small-headed quadrupedal herbivorous dinosaur of the Jurassic and early Cretaceous periods, with a double row of large bony plates or spines along the back.
Infraorder Stegosauria, order Ornithischia: several genera, including Stegosaurus
Origin:
modern Latin, from Greek stegē 'covering' + sauros 'lizard'
stegosaur in other Oxford dictionaries
Definition of stegosaur in the US English dictionary
