feldspathoid

noun

feld·​spath·​oid

-ˌthȯid

plural -s

: a mineral consisting of an aluminous silicate (as leucite nepheline) that has too little silica to form feldspar

feldspathoidal

¦⸗ˌ⸗¦thȯidᵊl

adjective

Word History

Etymology

International Scientific Vocabulary feldspath + -oid

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