Al·​ber·​to·​saur·​us | \ al-ˌbər-tə-ˈsȯr-əs How to pronounce Albertosaurus (audio) \

Definition of Albertosaurus

: a genus of large, carnivorous tyrannosaurid dinosaurs of the late Cretaceous known especially from fossils found in western North America Similarly, the heaviest Cretaceous tyrannosaurs, including Albertosaurus and the larger, 16,000-pound Tyrannosaurus rex, have, relatively speaking, some of the shortest forelimbs of any theropods.— Allison V. Andors, Natural History, June 1995

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of Albertosaurus

1905, in the meaning defined above

History and Etymology for Albertosaurus

borrowed from New Latin, from Alberta, province of Canada + New Latin -o- -o- + -saurus -saurus

Keep scrolling for more

Learn More about Albertosaurus

Time Traveler for Albertosaurus

Time Traveler

The first known use of Albertosaurus was in 1905

See more words from the same year

Statistics for Albertosaurus

Cite this Entry

“Albertosaurus.” Dictionary, Merriam-Webster, Accessed 28 May. 2020.

Comments on Albertosaurus

What made you want to look up Albertosaurus? 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

Obscure Shapes

  • a pile of three dimensional shapes in green
  • Something that is ooid is shaped like:
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!