A genus of shrubs of the order Saxifrageæ and the tribe Hydrangeæ, characterized by the inferior ovary, numerous stamens, and four or five imbricate petals.(noun)
The Century Dictionary (Public Domain)
Use "philadelphus" in a sentence
"The dark-leaved "Ravenswing" is a wonderful selection that you can invite into more intimate places, and I grow it with some success under early-flowering philadelphus and lilac."