any shrub belonging to the genus Hydrangea, of the saxifrage family, several species of which are cultivated for their large, showy flower clusters of white, pink, or blue.
Origin: < Neo-Latin (Linnaeus) < Greek hydr-hydr-1 + Neo-Latin angea, feminine noun based on Greek angeîon vessel; so called from cup-shaped seed capsule
1753, coined in Mod.L. by Linnæus as compound of Gk. hydr-, stem of hydor "water" (see water (n.1)) + angeion "vessel, capsule;" so called from the shrub's cup-shaped seed pods.