1. (noun) any of several trees of the genus Populus having leaves on flattened stalks so that they flutter in the lightest wind

• american aspen
• american quaking aspen
• populus tremuloides
• big-toothed aspen
• bigtooth aspen
• bigtoothed aspen
• canadian aspen
• large tooth aspen
• large-toothed aspen
• populus grandidentata
• european quaking aspen
• populus tremula
• quaking aspen

1. (noun) any of several trees of the genus Populus having leaves on flattened stalks so that they flutter in the lightest wind

• poplar
• poplar tree