peop. n. [ NL., fr. Gr. "y`dwr water + &unr_; vessel, capsule: cf. F. hydrangée.] (Bot.) A genus of shrubby plants bearing opposite leaves and large heads of showy flowers, white, or of various colors. Hydrangea hortensis, the common garden species, is a native of China or Japan. [1913 Webster]
prop. n. A natural family of plants including the hydrangeas, sometimes included in the family Saxifragaceae. Syn. -- family Hydrangeaceae, hydrangea family. [ WordNet 1.5 ]