al·​lo·​saur | \ ˈa-lə-ˌsȯr How to pronounce allosaur (audio) \

Definition of allosaur

: any of a family (Allosauridae) of large theropod dinosaurs usually having three clawed digits on each arm and leg and living from the Late Jurassic to the early Cretaceous period especially : allosaurus

Examples of allosaur in a Sentence

Recent Examples on the Web That right time began about 100 million years ago, when a period of intense volcanic activity caused a mini-mass extinction in the Northern Hemisphere, killing many of the larger dinosaurs, including allosaurs, the apex predators of their day. Eric Betz, Discover Magazine, "Tyrannosaurus Rex: Scary. Smart. Social?," 12 Apr. 2019 There's some evidence that tyrannosaurs may have been faster and more agile than other groups of large predatory dinosaurs, such as the earlier allosaurs. Michael Greshko, National Geographic, "World's biggest T. rex discovered," 26 Mar. 2019

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

First Known Use of allosaur

circa 1934, in the meaning defined above

Keep scrolling for more

Learn More about allosaur

Time Traveler for allosaur

Time Traveler

The first known use of allosaur was circa 1934

See more words from the same year

Statistics for allosaur

Cite this Entry

“Allosaur.” The Dictionary, Merriam-Webster Inc., Accessed 28 January 2020.

More from Merriam-Webster on allosaur

Rhyming Dictionary: Words that rhyme with allosaur Encyclopedia article about allosaur

Comments on allosaur

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


showing steady, earnest care and effort

Get Word of the Day daily email!

Test Your Vocabulary

Intact Latin Quiz

  • roman tablet
  • What did focus mean in Latin?
Spell It

Can you spell these 10 commonly misspelled words?

Add Diction

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!