propterygium

noun

prop·​ter·​yg·​i·​um

plural propterygia

-ēə

: the anterior of the three principal basal cartilages in the paired fins of some fishes (as sharks and rays) compare basipterygium

Word History

Etymology

New Latin, from pro- entry 1 + Greek pterygion fin, literally, small wing

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