essexite

noun

es·​sex·​ite

-sikˌsīt,

-sēk-

plural -s

: granular intrusive igneous rock of various kinds composed chiefly of hornblende, augite, and labradorite with variable amounts of accessory iron ore, biotite, orthoclase, nepheline, or olivine

Word History

Etymology

Essex county, Massachusetts + 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