thyrsus thyrsoidal • Thysanocarpus · · · Info · Definitions · Synonyms · Characters · · thyrsus · · Text Latin · · Script 7 · · Length Definitions · · · (noun) a dense flower cluster (as of the lilac or horse chestnut) in which the main axis is racemose and the branches are cymose. Synonyms: thyrse. · · Noun Definition 1 Synonyms · · · thyrse · · Synonym 1 Characters · · h latin small letter h U+0068 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075 y latin small letter y U+0079