1) River nymph 
[fungus] Naïs is a genus of fungi in the family Halosphaeriaceae. The genus, which contains two species, was circumscribed by mycologist Jan Kohlmeyer in 1962 to contain Naïs inornata. N. aquatica was described from submerged wood collected in north Queensland, Australia in 1992. ... Naïs is an opera by Jean-Philippe Rameau first performed on 22 April 1749 at the Opéra in Paris. It takes the form of a pastorale héroïque in three acts and a prologue. The librettist was Louis de Cahusac, in the fourth collaboration between him and Rameau. The work bears the subtitle Opéra pour La Paix, which refers to the fact that Rameau c...
• (n.) See Naiad. • (n.) See Naiad.
(from the article `annelid`) ...aquatic worms; male gonopores in segment immediately behind testes; seminal receptacle at or near segment containing testes; size, minute to 1–3 ...
Na'is noun [ Latin , a naiad.] (Zoology) See Naiad . 
National Animal Identification System.