- Any of various tyrannosaurid dinosaurs of the genus Tyrannosaurus, having a large head and teeth and short forelimbs, and including T. rex and possibly some other species. Also called tyrannosaur .
- See T. rex.
Origin of tyrannosaurusNew Latin Tyrannosaurus genus name Greek turannos tyrant sauros lizard
From Ancient Greek τύραννος (turannos, “tyrant”) + σαῦρος (sauros, “lizard”).