an·​ky·​lo·​sau·​rus | \ ˌaŋ-kə-lō-ˈsȯr-əs How to pronounce ankylosaurus (audio) \

Definition of ankylosaurus

: any of a North American genus (Ankylosaurus) of large ankylosaurs having a bony club at the end of the tail

Examples of ankylosaurus in a Sentence

Recent Examples on the Web There’s the tank-like ankylosaurus crushing opponents with its wrecking-ball tail. Cody Cassidy, Wired, 9 Apr. 2021 The ankylosaurus was not the only prehistoric beast to have an intimidating backside. Nicholas St. Fleur, New York Times, 16 Jan. 2018 And the bat and club were iconic features seen in both ankylosaurus and the glyptodons, which were ancient boulder-sized armadillos. Nicholas St. Fleur, New York Times, 16 Jan. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ankylosaurus.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of ankylosaurus

1907, in the meaning defined above

History and Etymology for ankylosaurus

borrowed from New Latin, from Greek ankýlos "bent, crooked, curved" + -saurus -saurus — more at angle entry 3

Note: The genus name was introduced by the American paleontologist Barnum Brown (1872-1963) in "The Ankylosauridæ, a new family of armored dinosaurs from the Upper Cretaceous," Bulletin of the American Museum of Natural History, vol. 24 (1908), pp. 187-201. Brown provides no explanation of the name. It is possible that ankylo- alludes not to the literal meaning of the Greek word, but rather to the medical term ankylosis in the sense "fusion of bones," given that one of what Brown considered "striking features" of the animal is that "posterior ribs [are] coössified to vertebræ."

Learn More About ankylosaurus

Time Traveler for ankylosaurus

Time Traveler

The first known use of ankylosaurus was in 1907

See more words from the same year

Dictionary Entries Near ankylosaurus




See More Nearby Entries 

Statistics for ankylosaurus

Cite this Entry

“Ankylosaurus.” Dictionary, Merriam-Webster, Accessed 25 Jun. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More from Merriam-Webster on ankylosaurus Encyclopedia article about ankylosaurus


Test Your Vocabulary

Great Words for Scrabble

  • scrabble tiles that read scrabble quiz
  • Which of the following Q-without-U words means the number five in cards or dice?
True or False

Test your knowledge - and maybe learn something along the way.

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!