an·ky·lo·saur·i·an 
(ăng′kə-lō-sôrē-ən)
(ăng′kə-lō-sôrē-ən)n.
Any of various herbivorous ornithischian dinosaurs of the group Ankylosauria of the Jurassic and Cretaceous Periods, having a squat armored body, a short neck, and a beaked mouth. Also called ankylosaur.
[From New Latin Ankylosauria, group name, from Ankylosaurus, type genus; see ANKYLOSAURUS.]
an′ky·lo·sauri·an adj.