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Any of various large carnivorous theropod dinosaurs of the family Allosauridae of the Jurassic and Cretaceous Periods, having a massive head with narrow jaws, hands with large claws, and sturdy legs with clawed feet. Also called allosaur.

[From New Latin Allosauridae, family name, from Allosaurus, type genus; see allosaurus.]

al′lo·saur′id adj.
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