nyssaceae nyssa sylvatica • nystagmic · · · Info · Definitions · Characters · · nyssaceae · · Text Latin · · Script 9 · · Length 3 · · Syllables Definitions · · · (noun) a family of dicotyledonous trees of order Myrtales that includes the sour gum trees. Synonyms: Nyssaceae, family Nyssaceae, sour-gum family, tupelo family. · · Noun Definition 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 n latin small letter n U+006E s latin small letter s U+0073 y latin small letter y U+0079