na·is | \ ˈnāə̇s \
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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