allosaurusPronunciation: /ˌaləˈsɔːrəs/Definition of allosaurus noun a large bipedal carnivorous dinosaur of the late Jurassic period. Genus Allosaurus, suborder Theropoda, order Saurischia Origin:modern Latin, from Greek allos 'other' + sauros 'lizard'allosaurus in other Oxford dictionaries Definition of allosaurus in the US English dictionary