\ ˈreks How to pronounce rex (audio) \
plural rexes or rex

Definition of rex

 (Entry 1 of 2)

: an animal (such as a domestic rabbit or cat) showing a genetic recessive variation in which the guard hairs are very short, sparse, or entirely lacking — compare cornish rex, devon rex


Latin noun
\ ˈreks How to pronounce rex (audio) \

Definition of rex (Entry 2 of 2)

: king

Illustration of rex

Illustration of rex


In the meaning defined above

Examples of rex in a Sentence

Recent Examples on the Web: Noun The videos feature Velociraptors,Triceratops, Brachiosauruses and a Tyrannosaurus rex. Hannah Kirby, Milwaukee Journal Sentinel, "Greendale couple makes 'Jurassic Park' house to entertain the community during the coronavirus pandemic," 12 May 2020 The teleosauroid Machimosaurus rex, the largest semi-aquatic thalattosuchian, could reach up to 10 meters in size, and is thought to have fed on hard prey like turtles due to its teeth, paleontologist Julia Schwab told CNN. Amy Woodyatt, CNN, "Deadly ancient crocodiles imitated whales to dominate the oceans," 21 Apr. 2020 Photo: roman pilipey/epa-efe/rex/shutte/EPA/Shutterstock The 1 percentage point reduction—to be carried out in two equal cuts on Jan. 15 and Jan. 25—will free up a net 800 billion yuan ($116.6 billion) for lending, according to the central bank. WSJ, "China Moves to Ramp Up Lending to Small Businesses," 4 Jan. 2019 On the same day, the police department in the southeastern city of Murcia tweeted video showing an unidentified citizen being stopped by police while trying to walk the streets dressed as a Tyrannosaurus rex. Lauren M. Johnson, CNN, "To get around stay-at-home orders, Spaniards have been walking some unusual 'pets'," 24 Apr. 2020 Trump’s supporters elected an apex predator, a T-rex, to eat the smaller, slimier pillagers who were devouring them. James Freeman, WSJ, "Can We Trust Facebook and Twitter?," 31 July 2018 There rest great carnivores of the Cretaceous, such as Albertosaurus, Gorgosaurus, Daspletosaurus and, of course, Tyrannosaurus rex. New York Times, "Canada’s Newest Tyrannosaur Is Named for a ‘Reaper of Death’," 11 Feb. 2020 Known as Thanatotheristes degrootorum, the species is one of the oldest ever found in North America and is directly linked to Tyrannosaurus rex, researchers said on Monday. Fox News, "New 'reaper of death' Tyrannosaur species discovered in Canada," 11 Feb. 2020 In addition to the dinosaur displays, attendees were also treated to a museum quality exhibit known as Real Dinosaur Fossils that included actual T-rex teeth and a triceratops horn. David Harten, The Courier-Journal, "At Jurassic Quest, fans feel roar of "true to detail" dinosaurs at Kentucky Expo Center," 2 Feb. 2020

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

See More

First Known Use of rex


1920, in the meaning defined above

History and Etymology for rex


modification of French castorrex, castorex, a variety of rabbit, perhaps from Latin castor beaver + rex king — more at castor, royal

Keep scrolling for more

Learn More about rex

Statistics for rex

Last Updated

27 May 2020

Cite this Entry

“Rex.” Dictionary, Merriam-Webster, Accessed 2 Jun. 2020.

More from Merriam-Webster on rex

Rhyming Dictionary: Words that rhyme with rex

Comments on rex

What made you want to look up rex? Please tell us where you read or heard it (including the quote, if possible).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

May 2020 Words of the Day Quiz

  • a blooming wisteria tree
  • Which is a synonym of exiguous?
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

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