• synonyms


  1. any of several herbivorous dinosaurs of the suborder Ankylosauria, from the Cretaceous Period, having the body covered with thick, bony plates.
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Origin of ankylosaur

First recorded in 1905–10, ankylosaur is from the New Latin word Ankylosauria name of the suborder. See ankylo-, -saur, -ia
Also called armored dinosaur.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for ankylosaur

Historical Examples

  • The Polacanthus and Ankylosaur developed a most effective armour-plating over the rear.

    The Story of Evolution

    Joseph McCabe

British Dictionary definitions for ankylosaur


  1. any of various quadrupedal herbivorous ornithischian dinosaurs constituting the suborder Ankylosauria, which were most abundant in upper Cretaceous times and had a very heavily armoured tanklike body
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Word Origin

C20: from New Latin, from Greek ankulos crooked + -saur
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

ankylosaur in Science


  1. A large, herbivorous dinosaur of the genus Ankylosaurus of the Cretaceous Period. Ankylosaurs had a squat, heavily armored body and a clubbed tail.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.