1. A genus of dicotyledonous trees of the order Salicineæ, including the poplar and aspen, having diœcious flowers in catkins without floral envelops, and distinguished from Salix, the willow, by the numerous ovules, obliquely lengthened and cup-shaped disks, broad and toothed bracts, loosely flowered and generally pendulous catkins, and broad leaves.

1. a genus of trees of the family Salicaceae that is found in the northern hemisphere; poplars