[ rohz-bey ]
/ ˈroʊzˌbeɪ /


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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for rosebay

/ (ˈrəʊzˌbeɪ) /


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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012