a shrub, Hydrangea arborescens, of the saxifrage family, common throughout the eastern half of the U.S., having egg-shaped leaves and a rounded cluster of white flowers.
Origin of wild hydrangea
An Americanism dating back to 1885–90
Also called sevenbark.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019