ceratosaurus

from The Century Dictionary.

• noun A genus of dinosaurian reptiles of great size, from the Upper Jurassic rocks of Colorado.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Paleon.) A swift-running bipedal carnivorous American Jurassic dinosaur allied to the European Megalosaurus. The animal was nearly twenty feet in length, and the skull bears a bony short horn between the nostrils on the united nasal bones. See Illustration in Appendix.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun 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