diactinal

adjective

di·​ac·​ti·​nal

(ˈ)dī¦aktənəl,

¦dīˌak¦tīnᵊl

variants or less commonly diactine

(ˈ)dī¦akˌtīn,

-tə̇n

zoology

: having two rays : pointed at both ends

Word History

Etymology

di- + -actinal, -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!