Pantotheria

plural noun

Pan·​to·​the·​ria

ˌpantəˈthirēə

: an order or other division of generalized mammals widespread during the Jurassic and commonly conceded to be ancestral to the marsupials and placental mammals

pantotherian

¦⸗⸗¦thirēən

adjective or noun

Word History

Etymology

New Latin, from panto- + -theria

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now