rosebay

[ rohz-bey ]
/ ˈroʊzˌbeɪ /

noun

any of several rhododendrons, as the great laurel of eastern North America or Rhododendron macrophyllum, of the west coast of North America.
British. the willow herb, Epilobium angustifolium.

Origin of rosebay

First recorded in 1540–50; rose1 + bay4

British Dictionary definitions for rosebay

rosebay
/ (ˈrəʊzˌbeɪ) /

noun

US any of several rhododendrons, esp Rhododendron maximum of E North America
rosebay willowherb a perennial onagraceous plant, Chamerion (formerly Epilobium) angustifolium, that has spikes of deep pink flowers and is widespread in open places throughout N temperate regions
another name for oleander