soft-finned

adjective

: having fins in which the membrane is supported entirely or almost entirely by soft or articulated rays

—used of the more advanced teleost fishes

—opposed to spiny-finned

Word History

Etymology

soft entry 1 + fin + -ed

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