allosaur
noun
al·lo·saur ˈa-lə-ˌsȯr 
: any of a family (Allosauridae) of large theropod dinosaurs usually having three clawed digits on each arm and leg and living from the Late Jurassic to the early Cretaceous period
especially : allosaurus
Example Sentences
Recent Examples on the Web That right time began about 100 million years ago, when a period of intense volcanic activity caused a mini-mass extinction in the Northern Hemisphere, killing many of the larger dinosaurs, including allosaurs, the apex predators of their day. 
Eric Betz, Discover Magazine, 12 Apr. 2019 There's some evidence that tyrannosaurs may have been faster and more agile than other groups of large predatory dinosaurs, such as the earlier allosaurs. Michael Greshko, National Geographic, 26 Mar. 2019
Eric Betz, Discover Magazine, 12 Apr. 2019 There's some evidence that tyrannosaurs may have been faster and more agile than other groups of large predatory dinosaurs, such as the earlier allosaurs. Michael Greshko, National Geographic, 26 Mar. 2019 Word History
First Known Use
circa 1934, in the meaning defined above