Medical Definition of hydrangea
1 capitalized : a large genus of widely distributed shrubs and one woody vine (family Saxifragaceae) with opposite leaves and showy clusters of usually sterile white, pink, or bluish flowers
2: any plant of the genus Hydrangea
3: the dried rhizome and roots of the wild plant of the genus Hydrangea (H. arborescens) formerly used in pharmacy as a diuretic
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