(redirected from Tyrannosaurus rex)
Also found in: Dictionary, Thesaurus, Acronyms, Wikipedia.


(tīrăn'ōsôr`əs, tĭr–) [Gr.,=tyrant lizard], member of a family, Tyrannosauridae, of bipedal carnivorous saurischian dinosaursdinosaur
[Gr., = terrible lizard], extinct land reptile of the Mesozoic era. The dinosaurs, which were egg-laying animals, ranged in length from 2 1-2 ft (91 cm) to about 127 ft (39 m).
..... Click the link for more information.
 characterized by having strong hind limbs, a muscular tail, and short forelimbs. Tyrannosaurids are theropods, having three toes on the hind feet. The oldest known tyrannosaurids lived approximately 120 million years ago. Fossilized bones have been found in Asia, North America, and Australia. The family includes Albertosaurus, Tarbosaurus, and Tyrannosaurus.

The best known species is the huge North American Tyrannosaurus rex, which lived around 70 million years ago. The largest were an estimated 39 ft (12 m) in total length and weighed around 10 tons. They had an elongated skull and large, spike-shaped teeth in jaws that could open to a 4-ft (122-cm) gape. Like the other tyrannosaurids, the short forelimbs had two fingers armed, like the three digits of the powerful hind limbs, with sharp, curved claws; on the foot was a spurred toe not reaching to the ground. T. rex is believed to have existed only for a short time in the late Cretaceous period and to have dominated the North American continent at that time; fossil remains have been found in the W United States.

For many years T. rex was believed to be the largest carnivorous dinosaur, but this honor was challenged by the 1995 discovery of the 42.6-ft (13-m) Giganotosaurus carolinii in Patagonia, the 1996 discovery of the 45-ft (13.7-m) Carcharodontosaurus saharicus in the Moroccan Sahara, and subsequent finds. Remains of a second Tyrannosaurus species, T. bataar, have been found in Mongolia. It was a contemporary of T. rex, but was somewhat smaller and had a comparatively smaller head and shorter arms.

The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a genus of gigantic carnivorous dinosaurs of the superfamily Carnosauria. The tyrannosaur, which reached lengths of 15 m and more and stood more than 6 m tall on its hind legs, was the largest terrestrial predator in history. It had a massive skull (up to 1.5 m in length) and powerful daggerlike teeth. Its strong hind legs and powerful tail helped support the body, while its forelimbs were reduced to short appendages. The tyrannosaur was one of the last dinosaurs to live on the earth. Its remains have been discovered in Upper Cretaceous deposits of North America. The tyrannosaur was related to the tarbosaur.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


, tyrannosaur
any large carnivorous bipedal dinosaur of the genus Tyrannosaurus, common in North America in upper Jurassic and Cretaceous times: suborder Theropoda (theropods)
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
"Essentially, we didn't know we had a cousin of Tyrannosaurus rex for many years," Nesbitt said.
TRIX THE TYRANNOSAURUS REX Weight 5-7 tons Height 41ft head to tail Diet Meat, including other dinosaurs Top speed 17mph Roamed the Earth 75million years ago DIPPY THE DIPLODOCUS Weight 10-15 tons Height 70ft head to tail Diet Vegetables and plants Top speed 6mph Roamed the Earth 170million years ago
These herbivore dinosaurs needed this kind of defense to survive their meat-eating neighbor, the Tyrannosaurus rex and other would-be predators.
In movies, meat-eating dinosaurs such as Tyrannosaurus rex are often depicted baring their teeth, dripping saliva and waving their tongues.
The predator's runty, two-fingered arms look like those of Tyrannosaurus rex.
30 (Xinhua) -- In about one and a half years the Netherlands should have another tourist magnet with the skeleton of a Tyrannosaurus Rex at Naturalis Biodiversity Center in Leiden, the director of Naturalis told Xinhua on Tuesday.
SALT LAKE CITY, Shawwal 26, 1435, Aug 22, 2014, SPA -- A dry wash full of 112-million-year-old dinosaur tracks that include prints left behind by an ankylosaurus, dromaeosaurus and a menacing ancestor of the Tyrannosaurus rex, are set to be opened to the public this fall near Moab, Utah.
IF someone told you there was a dinosaur called Pinocchio rex, you'd probably think they were fibbing But scientists have just found the skeleton of a long-nosed cousin of the Tyrannosaurus rex - and named it after the animated film character.
London, Apr 16 ( ANI ): A new study suggests that the Tyrannosaurus rex did not need proper arms, because its head and neck were so powerful.
USA An artist's impression issued by the University of Utah of a Lythronax argestes, a 2.5-tonne relative of Tyrannosaurus rex with knife-like teeth and eyes made for hunting, which has been given the title 'King of Gore'.
years ago bony plates along its back Cretaceous The two-legged meat eater All dinosaurs became 146 million to Tyrannosaurus rex; the extinct at the end 65 million horned, four-legged plant of this period--possibly years ago eater Triceratops because of an asteroid that struck Earth.
Based on the BBC television series, the arena spectacular sees Tyrannosaurus Rex and his awe-inspiring life-size pals return to stalk UK shores once more.