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[ti-ran-uh-sawr, tahy-] /tɪˈræn əˌsɔr, taɪ-/
a large, carnivorous dinosaur, Tyrannosaurus rex, from the Late Cretaceous Epoch of North America, that walked erect on its hind feet.
< New Latin Tyrannosaurus (1905), equivalent to Greek tyranno- (combining form representing týrannos tyrant) + saûros -saur
Can be confused
tyrannous, tyrannosaur. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for tyrannosaur
  • Its collection includes a number of dinosaur bones and skulls, topped by a full-sized tyrannosaur skeleton.
  • The discovery included the oldest tyrannosaur and a strange new, toothless dinosaur with an intriguing hand skeleton.
  • Imagine: herds of hadrosaurs trudging across the plain as snow falls, while a tyrannosaur stalks them from a distance.
  • Once the paleontologists recognized the jaw lesions, they found them in numerous tyrannosaur specimens.
British Dictionary definitions for tyrannosaur


any large carnivorous bipedal dinosaur of the genus Tyrannosaurus, common in North America in upper Jurassic and Cretaceous times: suborder Theropoda (theropods)
Word Origin
C19: from New Latin, from Greek turannostyrant + sauros lizard
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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tyrannosaur in Science
Any of various very large carnivorous dinosaurs of the genus Tyrannosaurus and related genera of the Cretaceous Period. Tyrannosaurs had very small forelimbs and a large head with sharp teeth. They walked on two legs, probably bent forward with their long tail stretched out as a counterbalance. Tyrannosaurs were theropods and probably distantly related to birds. The largest species, T. rex, grew to lengths of 14.3 m (47 ft) or more and may have been the largest land predator that ever lived.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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