Definition of nereis
1 capitalized : the type genus of Nereidae comprising usually large, often dimorphic, and frequently greenish polychaete worms — see clam worm
2 plural nereides : any marine worm of the genus Nereis
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 nereis
New Latin Nereid-, Nereis, from Latin, Nereid
Seen and Heard
What made you want to look up nereis? Please tell us where you read or heard it (including the quote, if possible).