triactinal

adjective

tri·​actinal

(ˈ)trī¦aktənəl,

¦trīˌak¦tīnᵊl

variants or less commonly triactine

(ˈ)trī¦akˌtīn,

-tə̇n

: having three rays

a triactinal sponge spicule

Word History

Etymology

tri- + -actinal or -actine

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