unio

noun

ˈyünēˌō

1

capitalized : the type genus of the family Unionidae comprising freshwater mussels that have an oblong shell pearly within and covered without by a greenish or blackish epidermis

2

plural unios

-ōz

or unionides

ˌ⸗⸗ˈänəˌdēz

: any mussel of Unio or a related genus

unioid

ˈ⸗⸗ˌȯid

adjective

Word History

Etymology

New Latin, from Latin, a large pearl

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