ultragaseous

adjective

ul·​tra·​gaseous

"+

: having the properties exhibited by gases under pressures of one millionth of an atmosphere or less

Word History

Etymology

ultra- + gaseous

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