trachybasalt

noun

trachy·​basalt

"+

: a rock that is intermediate in composition between trachyte and basalt and that contains both orthoclase and basic plagioclase

Word History

Etymology

German, from trachy- + basalt

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