What does Tyrannosaurus rex mean?
• TYRANNOSAURUS REX (noun) The noun TYRANNOSAURUS REX has 1 sense: 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 Familiarity information: TYRANNOSAURUS REX used as a noun is very rare.