How to pronounce naiad in English

"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."

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

"One of a group of butterflies. See Nymph."

"Any plant of the order Naiadaceae such as eelgrass pondweed etc."