illinium

noun

il·​lin·​i·​um

ə̇ˈlinēəm

plural -s

: chemical element 61

—a name now superseded by promethium

Word History

Etymology

New Latin, from Illinois + New Latin -ium

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