actinotrocha

noun

ac·​ti·​not·​ro·​cha

ˌak-tə-ˈnä-trə-kə

plural actinotrochae

ˌak-tə-ˈnä-trə-ˌkē

: the free-swimming larva of the genus Phoronis

Word History

Etymology

New Latin, from actin- + -trocha

First Known Use

1871, in the meaning defined above

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!