ornithischian, ornithischian dinosaur - herbivorous dinosaur with a pelvis like that of a bird

suborder Thyreophora, Thyreophora, thyreophoran - armored dinosaurs: stegosaurs and ankylosaurs

stegosaur, Stegosaur stenops, stegosaurus - herbivorous ornithischian dinosaur with a row of bony plates along its back and a spiked tail probably used as a weapon

ankylosaur, ankylosaurus - having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's