(n) any shrub of the genus Rhododendron: evergreen shrubs or small shrubby trees having leathery leaves and showy clusters of campanulate (bell-shaped) flowers
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
n. [ L., fr. Gr. "rodo`dendron, literally, rose tree; "ro`don rose + de`ndron tree. See Rose. ] (Bot.) A genus of shrubs or small trees, often having handsome evergreen leaves, and remarkable for the beauty of their flowers; rosebay. [ 1913 Webster ]