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naiad   WordNet 2.0

- (Greek mythology) a nymph of lakes and springs and rivers and fountains

 
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- submerged aquatic plant having narrow leaves and small flowers

- of fresh or brackish water

 
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Naiad   Webster's Revised Unabridged Dictionary (1913)

1. A water nymph; one of the lower female divinities, fabled to preside over some body of fresh water, as a lake, river, brook, or fountain.

2. (Zoöl.) Any species of a tribe (Naiades) of freshwater bivalves, including Unio, Anodonta, and numerous allied genera; a river mussel.

3. (Zoöl) One of a group of butterflies. See Nymph.

4. (Bot.) Any plant of the order Naiadaceæ, such as eelgrass, pondweed, etc.

 
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