noun

1. The asp tree; a kind of poplar tree (genus Populus sect. Populus). A medium-size tree with thin, straight trunks of a greenish-white color.

   "Above a certain elevation, the aspens gave way to scrubby, gnarled pines."

2. The wood of such a tree; usually pale, lightweight and soft.

   "She claimed that aspen was the only "proper" material from which make a wicker basket."