ty·ran·no·saur /təˈrænəˌsɔr, taɪ-/
  tyrannosaur
       n : 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 [syn: tyrannosaurus, Tyrannosaurus
           rex]