Nyssaceae Nyssa • nystagmic · · · Info · Definitions · Characters · · Nyssaceae · · Text Latin · · Script 9 · · Length Definitions · · · (noun) a family of dicotyledonous trees of order Myrtales that includes the sour gum trees. Synonyms: family Nyssaceae, sour-gum family, tupelo 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 e latin small letter e U+0065 s latin small letter s U+0073 y latin small letter y U+0079