Naiadaceae naiad • naiadaceous · · · Info · Definitions · Characters · · Naiadaceae · · Text Latin · · Script 10 · · Length Definitions · · · (noun) monotypic family of aquatic plants having narrow leaves and small flowers. Synonyms: family Naiadaceae, Najadaceae, family Najadaceae, naiad family. · · Noun Definition 1 Characters · · N latin capital letter n U+004E a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 i latin small letter i U+0069