Definition of nais
1 plural naises \-sə̇z\ or naides \ˈnāəˌdēz\ : a river nymph : naiad
2 capitalized [New Latin, from Latin, naiad] : a large genus of small aquatic oligochaete worms that is the type of the family Naididae
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 nais
Seen and Heard
What made you want to look up nais? Please tell us where you read or heard it (including the quote, if possible).