Triarthrus

noun

Tri·​ar·​thrus

trīˈärthrəs

: a genus of small Ordovician trilobites of which one form (T. eatoni) is often found with antennae and appendages in a good state of preservation

Word History

Etymology

New Latin, from tri- + Greek arthron joint

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