thermion

noun

therm·​ion

¦thərm+

plural -s

: an electrically charged particle emitted by an incandescent substance

Word History

Etymology

International Scientific Vocabulary therm- + ion

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