an·ky·lo·saur·us 
(ăng′kə-lō-sôrəs)
(ăng′kə-lō-sôrəs)n.
A large ankylosaurian dinosaur of the genus Ankylosaurus of the Cretaceous Period, having a clubbed tail. Also called ankylosaur.
[New Latin Ankylosaurus, genus name : Greek ankulos, crooked, bent + Greek sauros, lizard.]