variants or less commonly T-Rex
plural T. rexes also T-Rexes
: tyrannosaurus rex
Though no one can actually time a running dinosaur with a stopwatch, scientists still have some idea of how fast T. rex and his companions ran.Lilian T. Hoffecker
We don't know if T. rex hunted alone or in packs, if it pursued live prey or merely scavenged.Discover Magazine
Spielberg's dinosaurs had teeth prominently and terrifyingly on constant display, much like a modern crocodile. [Auburn University professor Thomas] Cullen and his team, however, have shown instead that the T-Rex … had lips that covered their teeth much like a modern monitor lizard.John West
T. rexes were among the largest meat-eaters on Earth during their reign … 144 million years ago. They had to eat a lot, and often, to support their enormous bodies.John Johnson Jr.

Examples of T. rex in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Kids can build a T. rex, then rebuild it into a Triceratops or Pterodactyl—three cool builds in one little box. Jacquelyn Smith, Parents, 8 July 2025 As the outlet notes, the setup of this scene emulates one from Michael Crichton's original 1990 novel Jurassic Park, where character Alan Grant encounters a swimming T. rex. Brenton Blanchet, People.com, 5 July 2025 There are intense suspense sequences involving the Delgado children escaping dinosaurs that call to mind the glass of water vibrating with each T. rex stomp in the first film. Katie Walsh, Twin Cities, 5 July 2025 The rest of the group is rendered by capable performers, but their dialogue consists of rote exposition and the occasional scream, as pterodactyls dive-bomb them and T. rexes snap in their faces. David Sims, The Atlantic, 4 July 2025 See All Example Sentences for T. rex

Word History

Etymology

New Latin, short for Tyrannosaurus rex

First Known Use

1915, in the meaning defined above

Time Traveler
The first known use of T. rex was in 1915

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Cite this Entry

“T. rex.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/T.%20rex. Accessed 22 Jul. 2025.

Kids Definition

T. rex

noun
Last Updated: - Updated example sentences
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