selenonium

noun

sel·​e·​no·​ni·​um

ˌseləˈnōnēəm

plural -s

: a univalent cation SeH₃⁺ or radical SeH₃ analogous to sulfonium with selenium in place of sulfur

Word History

Etymology

New Latin, from selen- entry 2 + -onium

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