actinostome
noun
ac·tin·o·stome
\ak-ˈti-nə-ˌstōm\
Definition of actinostome
-s
1 : the mouth of a radially symmetrical animal
2 : the peristome of an echinoderm
Explore Merriam-Webster
There's more!
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!
Origin and Etymology of actinostome
actin- + -stome
First Known Use: 1860
Seen and Heard
What made you want to look up actinostome? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!