1. Large carnivorous bipedal dinosaur having enormous teeth with knifelike serrations; may have been a scavenger rather than an active predator; later Cretaceous period in North America
   "The tyrannosaurus's tiny arms have long puzzled palaeontologists";
   - tyrannosaur, Tyrannosaurus rex

Derived forms: tyrannosauruses

Type of: bird-footed dinosaur, theropod, theropod dinosaur

Part of: genus Tyrannosaurus

Encyclopedia: Tyrannosaurus