hexactinal

adjective

hex·​ac·​ti·​nal

¦hek(ˌ)sak¦tīnᵊl,

(ˈ)hek¦saktənəl

variants or hexactine

(ˈ)hek¦sakˌtīn,

-tə̇n

: having six rays

hexactinal sponge spicules

Word History

Etymology

hexa- + -actinal or -actine

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!