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tyrannosaurus

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ty·ran·no·saur   (tĭ-rān'ə-sôr', tī-)   
n.  A very large carnivorous dinosaur of the Upper Cretaceous Period of North America, characterized by small forelimbs and a large head.

[New Latin Tyrannosaurus, genus name : Greek turannos, tyrant + Greek sauros, lizard.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

tyrannosaurus 
Use tyrannosaurus in a Sentence
carnivorous Cretaceous bipedal dinosaur, 1905, Mod.L., the genus name, coined by H.F. Osborn (published 1906 in "Bulletin of the American Museum of Natural History" XXI, p.259) from Gk. tyrannos "tyrant" + sauros "lizard."
Online Etymology Dictionary, © 2001 Douglas Harper
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