naiad

[ ney-ad, -uh d, nahy- ]
/ ˈneɪ æd, -əd, ˈnaɪ- /

noun, plural nai·ads, nai·a·des [ney-uh-deez, nahy-] /ˈneɪ əˌdiz, ˈnaɪ-/.

(sometimes initial capital letter) Classical Mythology. any of a class of nymphs presiding over rivers and springs.
the juvenile form of the dragonfly, damselfly, or mayfly.
a female swimmer, especially an expert one.
Botany. a plant of the genus Najas, having narrow leaves and solitary flowers.
Entomology. an aquatic nymph.
a freshwater mussel.

Origin of naiad

< Latin Nāïad- (stem of Nāïas) < Greek Nāïás a water nymph
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British Dictionary definitions for naiad

naiad

/ (ˈnaɪæd) /

noun plural -ads or -ades (-əˌdiːz)

Greek myth a nymph dwelling in a lake, river, spring, or fountain
the aquatic larva of the dragonfly, mayfly, and related insects
Also called: water nymph any monocotyledonous submerged aquatic plant of the genus Naias (or Najas), having narrow leaves and small flowers: family Naiadaceae (or Najadaceae)
any of certain freshwater mussels of the genus UnioSee mussel (def. 2)

Word Origin for naiad

C17: via Latin from Greek nāias water nymph; related to náein to flow
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012