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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·saur′i·an adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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(1999): Ankylosaurian dinosaur remains from the Upper Cretaceous of Lano (Iberian Peninsula).
Witmer and Ridgely examined skulls from two predators, Tyrannosaurus rex and Majungasaurus, and two ankylosaurian dinosaurs, Panoplosaurus and Euoplocephalus, both plant eaters with armored bodies and short snouts.
(2010): Ankylosaurian evidences from the Upper Cretaceous of South-Central Pyrenees (Lleida, Spain): a reappraisal.