T. rex

noun

ˈtē-ˈreks 

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

But the funniest clip on The Late Show this week was of Stephen Colbert trying to light a cigarette while having Pachycephalosaur (similar to T. rex) arms. —Bethy Squires, Vulture, 26 Sep. 2025

Everything in Earth history to follow, then, is a variation on a theme—though there would be some rather elaborate variations, from T. rexes to blue whales. —Peter Brannen august 28, Literary Hub, 28 Aug. 2025

But the trend can be traced back to the sale of Sue, one of the most complete and largest T. rex fossils ever found. —Jacopo Prisco, CNN Money, 15 Aug. 2025

The guy got eaten by a T. rex while hiding on the toilet? —Jordan Hoffman, EW.com, 14 Aug. 2025

Word History

Etymology

New Latin, short for Tyrannosaurus rex

First Known Use

1915, in the meaning defined above

Rhymes for T. rex

• becks
• checks
• czechs
• decks
• dex
• ex
• flecks
• flex
• hex
• lex
• necks
• pecks

Kids Definition

T. rex

noun

ˈtē-ˈreks 

: tyrannosaur