Metatheria

plural noun
Meta·the·ria

Definition of Metatheria 

1 : a hypothetical group ancestral to placental mammals postulated to have reached a stage of development equivalent to that of the marsupials

2 in some classifications : a group coextensive with Marsupialia

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 Metatheria

New Latin, from meta- + -theria

Keep scrolling for more

Learn More about Metatheria

Share Metatheria

Statistics for Metatheria

Look-up Popularity

Comments on Metatheria

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

WORD OF THE DAY

to make amends

Get Word of the Day daily email!

Test Your Vocabulary

Musical Words Quiz

  • gramophone
  • Which word describes a musical performance marked by the absence of instrumental accompaniment?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

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!