Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

English definition of “dinosaur”

dinosaur

noun [C]    /ˈdɑɪ·nəˌsɔr/
a reptile (= cold-blooded animal), some types of which were extremely large, that stopped existing a very long time ago A dinosaur is also something that is old and that has not been able to change when conditions have changed and is therefore no longer useful: The old car was a gas-guzzling dinosaur and we had to get rid of it.
(Definition of dinosaur noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of dinosaur

Browse related topics

You are looking at an entry to do with Prehistory, but you might be interested in these topics from the History topic area:

Definitions of “dinosaur” in other dictionaries

Word of the Day

exercise

physical activity that you do to make your body strong and healthy

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More