[as-puh
n] 
| 1. | any of various poplars, as Populus tremula, of Europe, and P. tremuloides (quaking aspen) or P. alba (white aspen), of America, having soft wood and alternate ovate leaves that tremble in the slightest breeze. |
| 2. | of or pertaining to the aspen. |
| 3. | trembling or quivering, like the leaves of the aspen. |
| quak·ing aspen (kwā'kĭng) n. A North American deciduous tree (Populus tremuloides) having broadly ovate, finely toothed leaves with a truncate base. |