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nais

noun na·is \ ˈnāə̇s \
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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

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