Placuna

noun

Pla·​cu·​na

plaˈkyünə

: a genus of large flattened tropical bivalve mollusks (order Filibranchia) with extremely thin nearly transparent shells that is related to Anomia but sometimes made the type of a separate family see windowpane oyster

Word History

Etymology

New Latin, from Greek plak-, plax flat surface

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