Top definition
Spinosaurus aegyptiacus was a highly unusual theropod dinosaur that lived in Egypt and Morocco around 90 million years ago. It is distinctly different from other carnosaurs in the respect that it has an unusually high vertibrae on it's back that give it a giant fin or sail, about 6 feet high, the purpose of which is not understood. It may have served as a cooling device, for heat dissipation or a sexual signal. Interestingly enough, an iguanodont from the same place at almost the same time, Ouranosaurus, had a similar sail.

The jaws of Spinosaurus are narrow and crocodile-like, and the teeth are straight and not serrated like those of Tyrannosaurus. This feature is very similar to the theropods Baryonyx and Suchomimus, both of which were probable fish-eaters.

Spinosaurus is known only from fragments, the first specimen was unfortunately destroyed during World War II. It is estimated that the beast was collosal, perhaps measuring 50 feet in length, but these are only estimates. It seems that although the creature may have been longer than Tyrannosaurus, it had a more slender build.

Pound for pound, both relatively and absolutely, Tyrannosaurus rex is the more formidable animal, despite what the movie Jurassic Park 3 depcits. T.rex would be heavier, more powerfully musculed, and have a much stronger bite than Spinosaurus.
If Tyrannosaurus and Spinosaurus ever fought in real life, T.rex would win, hands down!
by Killing Kittens June 09, 2004
Get the mug
Get a spinosaurus mug for your dog Beatrix.
A theropod dinosaur which, due to recent finds, currently holds the coveted title of "biggest meat eating dinosaur", displacing Giganotosaurus, which in turn displaced Tyrannosaurus Rex.

Spinosaurus was relatively obscure among the general public until it was featured in the film Jurassic Park III, where it replaced the T-Rex as the film's primary antagonist, appearing on JPIII's logo and and killing one in a breif fight near the beginning of the film. This defeat, however, did little to sway the popularity of T-Rex; indeed, many fans reacted negatively to the outcome of the fight. Dinosaur fans often debate the true outcome of such a battle, though in reality it could never take place due to the Spinosaurus and Tyrannosaurus living on different continents and existing millions of years apart from eachother. It is generally thought that the Tyrannosaurus' superior jaw strength would give it an advantage in such a battle.

However, the depiction of the Spinosaurus in JPIII as an unstoppable superpredator was inaccurate. Its delicate, bony dorsal fin and long, gator-like snout armed with straight, peglike teeth (as opposed to the ribbed, serrated fangs of theropods such as T-Rex), indicate that this beast was a specialised icthyovore as opposed to a hunter of large dinosaurs, growing massive on a diet of fish, as well as pterosaurs, crocodiles and just about anything else it could swallow whole.

Spinosaurus is closely related to Baryonyx and Suchomimus, but not to the similar looking Dimetrodon, which lived before the age of the dinosaurs.
The Spinosaurus is the biggest theropod.
Spinosaurus is a specialised fish eater.
by Steve October 15, 2006
Get the mug
Get a Spinosaurus mug for your guy Abdul.
Spinosaurus was a large predator, attaining a length of up to 60 feet and 5 tons. Despite his size, the carnivore was depicted in eating fish, but may have hunted small-sized dinosaurs. The mouth of the therapd was designed to catch fish, rather than crush or kill. The skull and the fragments were quite fragile, so the therapod had a very weak bite.

Spinosaurus was also shown in the movie Jurassic Park 3. Being depicted as a much more stronger, smarter and larger dinosaur then its past star, Tyrannosaurus. Spinosaurus was also seen defeating the notorious T. Rex. Although the depiction is false due to the fact that both carnivores never met in real life. Spinosaurus had many fragile bones. Its long sails and crocodile-like snout were not as strong as it seemed to be in JP3.

Many JP Fans have been debating over which was better if the the two ACTUALLY met in real life. Though Tyrannosaurus Rex would've won if it fought the huge Spinosaurus. Tyrannosaurus was built for hunting medium-sized animals. Spinosaurus was built for eating fish, and the chances of it winning are 1.5%/97.5%. Because of this the dinosaur wasn't adapted to hunting and spent most of his life wading in water and catching fish.
Spinosaurus may have been bigger but didn't have strong jaws and wasn't as musculed as T. Rex was.
by JPFANBOY August 21, 2007
Get the mug
Get a Spinosaurus mug for your brother Georges.
1. A member of the Dinosauria, Theropoda, noted as having elongated spines on it's back. Carnivore.

2. The idiot dinosaur that starred in Jurassic Park 3, and took the place of the tyrannosaur.

3. Any dumb moron who does things without thinking.

4. Brainless wonder.
1. Spinosaurus was found in the Upper Cretaceous in Egypt and Morocco.

2. Did that Spinosaurus just break it's neck?

3. Loser. You could have thought about that before you did it. Spino.

4. Did that Spinosaurus just walk into a tree?
Get the mug
Get a Spinosaurus mug for your dad Jerry.
A Big Weird Dinosaur That was a Carnivore & proved it was Bigger,Stronger,Faster,Heavier,Smarter & More agresive Then a Tyrannosaurus!!!!! Spinosaurus: Tyrannosaurus: 21 ft Tall 16 ft Tall 52 ft Long 43 ft Long 7 tonnes14,000ibs 6 tonnes12,000ibs 44 mph 32 mph 16 in Teeth 11 in Teeth
That Meat Eating Dinosaur on JurassicPark3 That Killed the Tyrannosaurus!!!!!
by OLSKOO September 20, 2003
Get the mug
Get a Spinosaurus mug for your grandma Zora.
Despite what was depicted by Jurassic Park 3, a spinosauraus was not NEARLY that big and was a quadraped.
Archeaology debates on the urbandictionary, LOL!
by Elitist February 05, 2004
Get the mug
Get a spinosaurus mug for your dog Jovana.