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.

1540–50; rose1 + bay4 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rosebay (ˈrəʊzˌbeɪ)
1.  (US) any of several rhododendrons, esp Rhododendron maximum of E North America
2.  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
3.  another name for oleander

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Rosebay rhododendron--boon or bane to resource managers.
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