1. Also called syringa. any of various shrubs belonging to the genus Philadelphus, of the saxifrage family, esp. P. coronarius, a widely cultivated species having fragrant white flowers.
2. any of various other shrubs or trees having flowers or fruit resembling those of the orange, as the laurel cherry.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.