1. Any tree of the genus Populus; also, the timber, which is soft, and capable of many uses.
The aspen poplar is Populus tremula and P. Tremuloides; balsam poplar is P. Balsamifera; Lombardy poplar (P. Dilatata) is a tall, spiry tree; white poplar is Populus alba.
2. The timber of the tulip tree; called also white poplar.
Origin: OE. Popler, OF. Poplier, F. Peuplier, fr. L. Populus poplar.