Aceratherium

noun

Acera·​the·​ri·​um

¦āˌserəˈthirēəm

: a genus of extinct hornless rhinoceroses of the Oligocene, Miocene, and Pliocene

Word History

Etymology

New Latin, irregular from Greek akeratos + New Latin -therium

First Known Use

circa 1845, in the meaning defined above

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