Real Dictionary

willow
variable noun: A willow or a willow tree is a type of tree with long branches and long narrow leaves that grows near water.

willow in American English
any of a genus (Salix) of trees and shrubs of the willow family, having usually narrow leaves, single, slipper-shaped bud scales, and staminate and pistillate catkins borne on separate plants: the flexible twigs of certain species are used in weaving bask
designating a family (Salicaceae, order Salicales) of dicotyledonous trees and shrubs including poplars
to clean (wool, cotton, etc.) with a willow
noun: any tree or shrub of the genus Salix, characterized by narrow, lance-shaped leaves and dense catkins bearing small flowers, many species having tough, pliable twigs or branches used for wickerwork, etc
transitive verb: to treat (textile fibers) with a willow

willow in British English
noun: a small town in S Alaska, about 113 km (70 miles) northwest of Anchorage: chosen as the site of the projected new state capital in 1976, a plan which never came to fruition. Pop: 1658 (2000)
noun: any of numerous salicaceous trees and shrubs of the genus Salix, such as the weeping willow and osiers of N temperate regions, which have graceful flexible branches, flowers in catkins, and feathery seeds