spi·no·saur·us 
(spī′nō-sôrəs)
(spī′nō-sôrəs)n.
A very large carnivorous theropod dinosaur of the genus Spinosaurus of the Cretaceous Period, characterized by a long narrow snout and long spines on the back that may have formed a sail-like structure.
[New Latin Spīnosaurus, genus name : Latin spīna, thorn + Greek sauros, lizard.]