uranopilite

noun

ura·​nopi·​lite

ˌyu̇rənōˈpīˌlīt,

-ˈnäpəˌlīt

plural -s

: a mineral (UO₂)₆(SO₄)(OH)₁₀.12H₂O that is a hydrous basic sulfate of uranium and occurs in yellow velvety incrustations composed of microscopic needlelike crystals

Word History

Etymology

German uranopilit, from uran- entry 2 + Greek pilos felt + German -it -ite (hair)

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