dinosaur - any of numerous extinct terrestrial reptiles of the Mesozoic era

order Saurischia, Saurischia - extinct terrestrial reptiles: theropods (carnivorous); sauropods (herbivorous)

sauropod, sauropod dinosaur - very large herbivorous dinosaur of the Jurassic and Cretaceous having a small head a long neck and tail and five-toed limbs; largest known land animal

bird-footed dinosaur, theropod, theropod dinosaur - any of numerous carnivorous dinosaurs of the Triassic to Cretaceous with short forelimbs that walked or ran on strong hind legs