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Definition of: tyrannosaurus
(ti·ran′ə·sôr′əs, tī-) noun Paleontol.
A carnivorous dinosaur (Tyrannosaurus rex) inhabiting North America in the Cretaceous period: it was characterized by its huge bulk, massive jaws, and ability to walk erect on its hind legs. [<NL <Gk. tyrannos a tyrant + sauros a lizard]
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