Definition of "tyrannosaur" [tyrannosaur]

• A very large carnivorous dinosaur of the Upper Cretaceous Period of North America, characterized by small forelimbs and a large head. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "They can break a tyrannosaur's neck with a swipe of their tail."
• "Say "tyrannosaur" and most people picture a clunky, heavy-set beast with huge teeth and a brutish character."
• "One thing that we see in other tyrannosaur species is evidence that maybe some of these young animals actually palled around in groups of juveniles - sort of rambling gangs of young tyrannosaurs - potentially even avoiding the adults."