Nyctaginaceae nychthemeron • nyctaginaceous · · · Info · Definitions · Characters · · Nyctaginaceae · · Text Latin · · Script 13 · · Length Definitions · · · (noun) a family of flowering plants of the order Caryophyllales. Synonyms: family Nyctaginaceae, Allioniaceae, family Allioniaceae, four-o'clock 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 g latin small letter g U+0067 i latin small letter i U+0069 n latin small letter n U+006E t latin small letter t U+0074 y latin small letter y U+0079