Noah Webster
Aspen
ASP'EN or ASP, noun
A species of the poplar, so called from the trembling of its leaves, which move with the slightest impulse of the air. Its leaves are roundish, smooth, and stand on long slender foot-stalks.
ASP'EN, adjective Pertaining to the aspen or resembling it; made of aspen wood.
Nor aspen leaves confess the gentlest breeze.