Naiad

n.	1.	(Myth.) 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.	(Zool.) Any species of a tribe (Naiades) of freshwater bivalves, including Unio, Anodonta, and numerous allied genera; a river mussel.
	3.	(Zool) One of a group of butterflies. See Nymph.
	4.	(Bot.) Any plant of the order Naiadaceæ, such as eelgrass, pondweed, etc.

Noun	1.	naiad - submerged aquatic plant having narrow leaves and small flowers; of fresh or brackish water Synonyms: water nymph
	2.	naiad - (Greek mythology) a nymph of lakes and springs and rivers and fountains

Davy, Davy Jones, Neptune, Nereid, Oceanid, Oceanus, Poseidon, Thetis, Triton, fresh-water nymph, kelpie, limniad, man fish, mermaid, merman, nix, nixie, ocean nymph, sea nymph, sea-maid, sea-maiden, siren, undine, water god, water spirit, water sprite