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Any of various theropod dinosaurs of the group Ceratosauria of the Triassic and Jurassic Periods, often with a crest or horn on the head, and including coelophysis and dilophosaurus.

[From New Latin Cerātosauria, group name, after Cerātosaurus, type genus : Greek keras, kerāt-, horn; see ker- in Indo-European roots + 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.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ceratosaur - primitive medium-sized theropodceratosaur - primitive medium-sized theropod; swift-running bipedal carnivorous dinosaur having grasping hands with sharp claws and a short horn between the nostrils; Jurassic in North America
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
suborder Ceratosaura - primitive saurischian dinosaurs
coelophysis - one of the oldest known dinosaurs; late Triassic; cannibalistic
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