Definition of white poplar
1 a
:a Eurasian poplar (Populus alba) that is widely cultivated and naturalized in the U.S. and has whitish bark and leaves with a white-tomentose lower surface
b
:an aspen (Populus tremuloides) of the U.S. with small leaves and long petioles
2
:the wood of a tulip tree (Liriodendron tulipifera)
