tyrannosaur, tyrannosaurus, Tyrannosaurus rex

large carnivorous bipedal dinosaur having enormous teeth with knifelike serrations; may have been a scavenger rather than an active predator; Upper Cretaceous; North America

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

• genus Tyrannosaurus — includes a single species