Dictionary.net

Any tree of the genus Populus; also, the timber, which is soft, and capable of many uses.

The timber of the tulip tree; -- called also white poplar.

A tree of rapid growth, with a light, soft wood.

A tree common in the northern hemisphere, of rapid growth, and having soft wood.

Genus of trees.

A genus (Poputus) of trees the bark of which contains populin and salicin.

n. [Latin] A genus of tress of several species, as the black, white, grey poplar, the aspen tree, &c. The species are all of rapid growth, with soft wood.