Theria

1 of 2

plural noun

The·​ria

ˈthirēə,

ˈthēr-

in some classifications

: a subclass of Mammalia comprising the higher mammals and including the Pantotheria, Metatheria, and Eutheria and excluding the Prototheria and Allotheria

therian

-ən 

noun or adjective

-theria

2 of 2

noun combining form

"

: beasts : animals

—in names of higher taxa of mammalian forms

Prototheria

Word History

Etymology

Plural noun

New Latin, from Greek thēria, plural of thērion wild animal

Noun combining form

New Latin, from Greek thēria, plural of thērion

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!