Definition of Athyris
: a genus of smooth biconvex extinct brachiopods having the plates of the brachidium prolonged into spirally rolled laterally directed processes
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.
Join MWU now and get access to America’s largest dictionary, with:
- 300,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Origin and Etymology of athyris
New Latin, from 2a- + Greek thyris valve, opening
Seen and Heard
What made you want to look up Athyris? Please tell us where you read or heard it (including the quote, if possible).