cooperite

noun

coop·​er·​ite

ˈküpəˌrīt

plural -s

: a steel-gray mineral PtS of metallic luster consisting of a sulfide of platinum belonging to the tetragonal system and occurring usually in irregular grains

Word History

Etymology

R. A. Cooper, flourished about 1920, who first described it + English -ite

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