al·lo·saur·id 
(ăl′ə-sôrĭd)
(ăl′ə-sôrĭd)n.
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·saurid adj.