Mosasaurus

noun
Mo·​sa·​sau·​rus

Definition of Mosasaurus

: a genus (the type of the family Mosasauridae) of large extinct aquatic Cretaceous fish-eating lizards related to the recent monitors but having the limbs modified into swimming paddles

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!

History and Etymology for Mosasaurus

New Latin, from Latin Mosa the river Meuse (near which the first known species was discovered) + New Latin -saurus

Keep scrolling for more

Learn More about Mosasaurus

Statistics for Mosasaurus

Cite this Entry

“Mosasaurus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Mosasaurus. Accessed 8 Aug. 2020.

Comments on Mosasaurus

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

WORD OF THE DAY

Test Your Vocabulary

Original Meanings Quiz

  • rembrandt painting a young scholar and his tutor
  • Which of the following is the earliest known sense of the word awe?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

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!