Trilliaceae trilli • trilliaceous · · · Info · Definitions · Characters · · Trilliaceae · · Text Latin · · Script 11 · · Length Definitions · · · (noun) small family of herbs having flowers with 3 petals and 3 sepals; in some classification systems considered a subfamily of the Liliaceae. Synonyms: family Trilliaceae, trillium family. · · Noun Definition 1 Characters · · T latin capital letter t U+0054 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C r latin small letter r U+0072