• (a.) Having the stamens arranged in five clusters, those of each cluster having their filaments more or less united, as the flowers of the linden.
Pen`ta·del'phous adjective [ Penta- + Greek ... brother.] (Botany) Having the stamens arranged in five clusters, those of each cluster having their filaments more or less united, as the flowers of the linden. 
pentadelphous In botany, a reference to stamens that are united by the filaments in five bundles; (of a plant) having the stamens so united.