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A very large allosaurid dinosaur of the genus Allosaurus of the late Jurassic Period, having a pair of bony bumps above the eyes. Also called allosaur.
[New Latin, genus name : Greek allos, other (because the imperfectly preserved vertebrae of the first specimen to be described appeared to have an hourglass shape unlike those of other dinosaurs); see allo- + Greek sauros, lizard.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||allosaurus - late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus|
bird-footed dinosaur, theropod, theropod dinosaur - any of numerous carnivorous dinosaurs of the Triassic to Cretaceous with short forelimbs that walked or ran on strong hind legs
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