dinosaur

noun
di·​no·​saur | \ ˈdī-nə-ˌsȯr How to pronounce dinosaur (audio) \

Definition of dinosaur

1 : any of a group (Dinosauria) of extinct often very large chiefly terrestrial carnivorous or herbivorous reptiles of the Mesozoic era
2 : any of various large extinct reptiles (such as ichthyosaurs) other than the true dinosaurs
3 : one that is impractically large, out-of-date, or obsolete The factory is now a rusting dinosaur.

Keep scrolling for more

Other Words from dinosaur

dinosaurian \ ˌdī-​nə-​ˈsȯr-​ē-​ən How to pronounce dinosaurian (audio) \ adjective
dinosauric \ ˌdī-​nə-​ˈsȯr-​ik How to pronounce dinosauric (audio) \ adjective

Synonyms for dinosaur

Synonyms

has-been, relic

Visit the Thesaurus for More 

Examples of dinosaur in a Sentence

The old factory is now a rusting dinosaur. The character she plays is a dinosaur—a former beauty queen who is living in the past.

Recent Examples on the Web

Dominating that world were, of course, the dinosaurs. John Steele Gordon, WSJ, "‘Dinosaurs Rediscovered’ Review: No Longer Dragging Their Tails," 9 May 2019 Ambopteryx is just the second dinosaur ever discovered with them. David Grossman, Popular Mechanics, "Whoa, Look at This Bird-Bat Dinosaur," 8 May 2019 This is due to the fact that bedbugs glom on to animals that live in stationary homes (nests, burrows), which was a habit that dinosaurs—who were roamers—never adopted. Daisy Hernandez, Popular Mechanics, "Surprisingly, Bed Bugs Are As Old As Dinosaurs," 16 May 2019 Image Before the giant ape and the cancan chorus, before the daydreaming misfit and the defiant dancer, before even the dinosaurs and the dragons, first there were the RVs. Michael Paulson, New York Times, "Four Musicals on Three Continents: An Australian Company’s Big Bet," 5 July 2018 Westgate Wednesdays Celebrate summer with princesses, pirates, dinosaurs and more characters at Westgate's splash pad amid prize giveaways, music and dancing. Sonja Haller, azcentral, "Best kids things to do in Phoenix in July: Splash pad parties, shark feeds and free fun," 28 June 2018 The impact of an asteroid about six miles in diameter some 65 million years ago led to the extinction of the dinosaurs and many other species. William Harwood, CBS News, "NASA asteroid-watchers team up on emergency plan with White House, FEMA," 20 June 2018 Over many years of being quirky and accessible in a largely humorless profession, Leach has managed to develop a cult of personality that enjoys his random musings on dinosaurs and pirates. Dan Wolken, USA TODAY, "Mike Leach's tweet of an anti-Obama hoax showed why many schools won't hire him," 18 June 2018 Jules Verne imagined dinosaurs and enormous humans living underground in Journey to the Center of the Earth, while H. Rider Haggard created a lost civilization in King Solomon’s Mines. Lorraine Boissoneault, Smithsonian, "What if Napoleon Hadn’t Lost Europe and Other Questions of Alternate History," 14 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'dinosaur.' 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 dinosaur

1841, in the meaning defined at sense 1

History and Etymology for dinosaur

New Latin Dinosaurus, genus name, from Greek deinos terrifying + sauros lizard — more at dire

Keep scrolling for more

Learn More about dinosaur

Statistics for dinosaur

Last Updated

6 Jun 2019

Look-up Popularity

Time Traveler for dinosaur

The first known use of dinosaur was in 1841

See more words from the same year

Keep scrolling for more

More Definitions for dinosaur

dinosaur

noun

English Language Learners Definition of dinosaur

: one of many reptiles that lived on Earth millions of years ago
: someone or something that is no longer useful or current : an obsolete or out-of-date person or thing

dinosaur

noun
di·​no·​saur | \ ˈdī-nə-ˌsȯr How to pronounce dinosaur (audio) \

Kids Definition of dinosaur

: any of a group of extinct often very large mostly land-dwelling reptiles that lived millions of years ago

Keep scrolling for more

Comments on dinosaur

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

WORD OF THE DAY

incapable of being surmounted or overcome

Get Word of the Day daily email!

Test Your Vocabulary

Finance Words Quiz

  • a-piggy-bank
  • The etymology of mortgage is related most closely to which two words?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Word Winder's CrossWinder

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

TAKE THE QUIZ
Love words? Need even more definitions?

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