1.NounSynonym of ankylosaurus, Ankylosaurus magniventris, a herbivorous dinosaur of the Cretaceous period notable for its heavy armor and clublike tail.
2.NounSynonym of ankylosaurian, any member of the suborder Ankylosauria, herbivorous dinosaurs notable for their armor in the form of bony osteoderms. .mw-parser-output .defdate{font-size:smaller}