Allosaurus(redirected from Big Al (fossil))
Also found in: Dictionary, Thesaurus.
Allosaurus, late Jurassic carnivorous dinosaur of the W United States. Specimens of 30 to 40 ft (9 to 12 m) have been found. It had stong hind legs, smaller sharply clawed forelimbs, two small horns directly above the eyes, and expandable jaws that could widen to consume large pieces of meat.
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A carnivorous therapod dinosaur, 40 feet (12 meters) long, and weighing 1.5 tons, from the Late Jurassic Period that had muscular hindlimbs, small forelimbs (with three-fingered hands), and sharp teeth; similar to but smaller than Tyrannosaurus.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.