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tyrannosaur, tyrannosaurus, Tyrannosaurus rex | large carnivorous bipedal dinosaur having enormous teeth with knifelike serrations; may have been a scavenger rather than an active predator; 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 ❲Tyrannosaurus rex❳ |