[ti-ran-uh-sawr, tahy-]
a large, carnivorous dinosaur, Tyrannosaurus rex, from the Late Cretaceous Epoch of North America, that walked erect on its hind feet.

< Neo-Latin Tyrannosaurus (1905), equivalent to Greek tyranno- (combining form representing týrannos tyrant) + saûros -saur

tyrannous, tyrannosaur.
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World English Dictionary
tyrannosaurus or tyrannosaur (tɪˌrænəˈsɔːrəs, tɪˈrænəˌsɔː)
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
[C19: from New Latin, from Greek turannostyrant + sauros lizard]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
tyrannosaur   (tĭ-rān'ə-sôr')  Pronunciation Key 
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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Example sentences
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.
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