afwillite

noun

af·​wil·​lite

ˈaf-wə-ˌlīt

plural -s

: a mineral Ca₃Si₂O₄(OH)₆ consisting of a hydrous calcium silicate and occurring in colorless monoclinic crystals (specific gravity 2.6)

Word History

Etymology

Alpheus Fuller Williams †1953 American mining engineer + -ite entry 1

First Known Use

1925, in the meaning defined above

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