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
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Origin and Etymology of nais
Latin — more at naid
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