philadelphus n 1: any of various chiefly deciduous ornamental shrubs of the genus Philadelphus having white sweet-scented flowers, single or in clusters; widely grown in temperate regions
philadelphus \philadelphus\ n. Any of various chiefly deciduous ornamental shrubs of the genus {Philadelphus} having white sweet-scented flowers, single or in clusters; it is widely grown in temperate regions. [WordNet 1.5]