had·​ro·​saur ˈha-drə-ˌsȯr How to pronounce hadrosaur (audio)
: any of a genus (Hadrosaurus) or family (Hadrosauridae) of mainly bipedal dinosaurs of the Late Cretaceous that have the forward part of the jaws toothless and flattened into a beak-like snout and the back part of the jaws filled with rows of numerous small, grinding teeth and that often have a solid or hollow bony crest on the skull : duck-billed dinosaur
… the hadrosaurs evolved into some 21 different species during their 20 million-year stint on earth …Virginia Morell

Examples of hadrosaur in a Sentence

Recent Examples on the Web And while bonebeds with ankylosaurs, hadrosaurs, and sauropods have hinted at herd behavior, so, too, have deposited dino tracks, suggesting some dinosaurs had a distinct social streak. Sam Walters, Discover Magazine, 28 Mar. 2024 This herbivorous hadrosaur apparently tended her eggs and raised her offspring for more than a year after hatching. Roger S. Seymour, Discover Magazine, 5 Oct. 2023 Keller is a graduate student working with the University of Alaska Museum of the North’s Patrick Druckenmiller, one of the researchers who has helped recover the bones of hadrosaurs and other dinosaurs from bluffs of the Colville River in northern Alaska. Ned Rozell | Alaska Science, Anchorage Daily News, 25 Feb. 2023 On the basis of the new information, researchers now estimate that this hadrosaur could have run roughly 27 miles per hour. Megan Talkington, Discover Magazine, 6 Feb. 2010 The most likely candidate, say the researchers, were duckbilled dinosaurs, such as the hadrosaur. Gemma Tarlach, Discover Magazine, 21 Sep. 2017 Paleontologists used to think that a dinosaur, or any prehistoric creature, needed to be buried extremely rapidly for soft tissue to be preserved – but this was not the case for this poor hadrosaur. Katie Hunt, CNN, 14 Oct. 2022 New research on a 7-meter (23-foot) long Edmontosaurus, a type of plant-eating hadrosaur, found near the town of Marmarth, North Dakota, in 1999 has shed light on what factors allowed the skin to survive through the eons. Katie Hunt, CNN, 14 Oct. 2022 The annoying impulse repeats itself over and over again through the young hadrosaur’s body. Riley Black, Smithsonian Magazine, 26 Apr. 2022

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'hadrosaur.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


New Latin Hadrosaurus, genus name, from Greek hadros thick, bulky + sauros lizard

First Known Use

1877, in the meaning defined above

Time Traveler
The first known use of hadrosaur was in 1877

Dictionary Entries Near hadrosaur

Cite this Entry

“Hadrosaur.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hadrosaur. Accessed 23 Apr. 2024.

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