- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- 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