pinacoid

noun

pin·​a·​coid

variants or less commonly pinakoid

ˈpinəˌkȯid

plural -s

1

: a crystal form consisting of two parallel and opposite faces

2

: a crystal form whose faces are parallel to two crystal axes

Word History

Etymology

International Scientific Vocabulary pinac- + -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