Science Dictionary
allosaurus (āl'ə-sôr'əs) or allosaur   (āl'ə-sôr'əs)  Pronunciation Key 
Any of various carnivorous dinosaurs of the genus Allosaurus of the late Jurassic and early Cretaceous Periods. Allosaurs were similar to but smaller than tyrannosaurs.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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