archosaur
noun
ar·cho·saur
ˈär-kə-ˌsȯr 
: any of a subclass (Archosauria) of reptiles comprising the dinosaurs, pterosaurs, and crocodilians
Examples of archosaur in a Sentence
Recent Examples on the Web
The discovery immediately sparked debate over the evolutionary pathways of miniaturization and morphological convergence, challenging assumptions about how small archosaurs could become and how to interpret highly specialized skull forms in the fossil record.
—
Scott Travers, Forbes.com, 29 Apr. 2025
During the Triassic, a broad group known as the archosaurs evolved and eventually split into two major lineages.
—Sean Mowbray, Discover Magazine, 1 Aug. 2024
Nesbitt says that these small differences are what paleontologists expected to find, especially as researchers find fossils that sit closer to the common ancestor of all archosaurs.
—Joshua Rapp Learn, Discover Magazine, 15 Aug. 2023
Birds and crocodilians are archosaurs, the living relatives of non-avian dinosaurs and pterosaurs.
—Jeanne Timmons, Ars Technica, 26 July 2023
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Scientists have unveiled a new species of archosaur, a reptile that existed around the dawn of the dinosaurs.
—Joshua Rapp Learn, Discover Magazine, 15 Aug. 2023
That's because the initial dig was focused more on ancient mammal fossils, so these archosaur fossils gathered academic dust for a time.
—Joshua Rapp Learn, Discover Magazine, 15 Aug. 2023
They were also accompanied by archosaurs, a group that included early dinosaurs.
—Sean Mowbray, Discover Magazine, 21 June 2023
At the end of the Triassic period, small-sized dinosaurs roamed Earth alongside other groups of archosaurs—that is, until a widespread extinction event cleared the way for dinos to put on some serious size.
—Darren Orf, Popular Mechanics, 16 May 2023
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Scott Travers, Forbes.com, 29 Apr. 2025
During the Triassic, a broad group known as the archosaurs evolved and eventually split into two major lineages.
—Sean Mowbray, Discover Magazine, 1 Aug. 2024
Nesbitt says that these small differences are what paleontologists expected to find, especially as researchers find fossils that sit closer to the common ancestor of all archosaurs.
—Joshua Rapp Learn, Discover Magazine, 15 Aug. 2023
Birds and crocodilians are archosaurs, the living relatives of non-avian dinosaurs and pterosaurs.
—Jeanne Timmons, Ars Technica, 26 July 2023
Newsletter Sign up for our email newsletter for the latest science news
Scientists have unveiled a new species of archosaur, a reptile that existed around the dawn of the dinosaurs.
—Joshua Rapp Learn, Discover Magazine, 15 Aug. 2023
That's because the initial dig was focused more on ancient mammal fossils, so these archosaur fossils gathered academic dust for a time.
—Joshua Rapp Learn, Discover Magazine, 15 Aug. 2023
They were also accompanied by archosaurs, a group that included early dinosaurs.
—Sean Mowbray, Discover Magazine, 21 June 2023
At the end of the Triassic period, small-sized dinosaurs roamed Earth alongside other groups of archosaurs—that is, until a widespread extinction event cleared the way for dinos to put on some serious size.
—Darren Orf, Popular Mechanics, 16 May 2023
Cite this Entry
“Archosaur.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/archosaur. Accessed 8 Jul. 2025.
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