Definition that contains rhododendron
- rhododendron any shrub of the genus Rhododendron: evergreen shrubs or small shrubby trees having leathery leaves and showy clusters of campanulate (bell-shaped) flowers
- azaleastrum group of evergreen or deciduous shrubs formerly considered a separate genus; now included in the genus Rhododendron
- subgenus azalea group of evergreen or deciduous shrubs formerly considered a separate genus; now included in the genus Rhododendron
- coast rhododendron medium-sized rhododendron of Pacific coast of North America having large rosy brown-spotted flowers
- subgenus azaleastrum group of evergreen or deciduous shrubs formerly considered a separate genus; now included in the genus Rhododendron
- rhododendron californicum medium-sized rhododendron of Pacific coast of North America having large rosy brown-spotted flowers
- rosebay late-spring-blooming rhododendron of eastern North America having rosy to pink-purple flowers
- rhododendron maxima late-spring-blooming rhododendron of eastern North America having rosy to pink-purple flowers