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noun any shrub of the genus Rhododendron: evergreen shrubs or small shrubby trees having leathery leaves and showy clusters of campanulate (bell-shaped) flowers
originThe obsolete sense derives from Latin rhododendron (“oleander”), from Ancient Greek ῥοδόδενδρον (rhodódendron, “oleander”), from ῥόδον (rhódon, “rose”) + δένδρον (déndron, “tree”). The modern sense comes through the intermediary of the genus name Rhododendron, not closely related taxonomically, but with similar flowers to those of oleander.
Etymology from Wiktionary, CC BY-SA 3.0