Top Definition
A Jurassic dinosaur represented by 4-6 identified species. Ranging in length from 5-13.5 meters, it was one of the largest carnivores until the rise of the tyrranosaurids about fifty million years later.
"The genus Allosaurus has been discovered in Upper Jurassic sediments (160 million years ago) in the U.S. "
by Ariadne December 01, 2003

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