family unionidae family umbelliferae • family unit · · · Info · Definitions · Characters · · family unionidae · · Text Common · · Latin · · Scripts 16 · · Length 6 · · Syllables Definitions · · · (noun) freshwater mussels found worldwide. Synonyms: Unionidae, family Unionidae. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 f latin small letter f U+0066 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F u latin small letter u U+0075 y latin small letter y U+0079