allosaurus(redirected from Big Al (fossil))
Also found in: Thesaurus, Encyclopedia, Wikipedia.
A very large allosaurid dinosaur of the genus Allosaurus of the late Jurassic Period, having a pair of bony bumps above the eyes. Also called allosaur.
[New Latin, genus name : Greek allos, other (because the imperfectly preserved vertebrae of the first specimen to be described appeared to have an hourglass shape unlike those of other dinosaurs); see allo- + Greek sauros, lizard.]
Switch to new thesaurus
|Noun||1.||allosaurus - late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus|
bird-footed dinosaur, theropod, theropod dinosaur - any of numerous carnivorous dinosaurs of the Triassic to Cretaceous with short forelimbs that walked or ran on strong hind legs