tyrannosaurus

World English Dictionary
tyrannosaurus or tyrannosaur (tɪˌrænəˈsɔːrəs, tɪˈrænəˌsɔː)
 
n
any large carnivorous bipedal dinosaur of the genus Tyrannosaurus, common in North America in upper Jurassic and Cretaceous times: suborder Theropoda (theropods)
 
[C19: from New Latin, from Greek turannostyrant + sauros lizard]
 
tyrannosaur or tyrannosaur
 
n
 
[C19: from New Latin, from Greek turannostyrant + sauros lizard]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

tyrannosaurus
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, © 2010 Douglas Harper
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