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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.
Origin of tyrannosaur
< 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. 2018.
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Examples from the Web for tyrannosaur
Contemporary Examples
Historical Examples
  • Kirk grimaced and DeVore saw a faint image of a tyrannosaur, which reared up, jaws agape.

    Final Weapon Everett B. Cole
  • It is somewhat older than the tyrannosaur although still of the late Cretacic period, and may have been ancestral to it.


    William Diller Matthew
  • The largest of these grew to be 30 feet long and 15 to 20 feet high, comparable, therefore, to the tyrannosaur in size.

    Geology William J. Miller
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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