carcharodontosaurus saharicus is the largest meat-eating dinosaur known to have ever lived on the Earth (along with Giganotosaurus - now believed to be the same creature).  Before its discovery, Tyrannosaurus rex was thought to be the largest but this monster exceeds T. rex in size and really is the "king"!  Carcharodontosaurus had a massive tail, stout body mass, and heavy bones.  Its arms were short and its hands had three fingers with sharp claws.  Carcharodontosaurus grew up to 45 feet long, had a 6 foot skull and is estimated to have weighed eight tons. 

Morocco
CRETACEOUS:  98 - 93 million years ago
This tooth isn't in the greatest condition but is a large and genuine Carcharodontosaurus tooth.
Measures 6cm