American Heritage® Dictionary of the English Language, Fourth Edition
- n. A North American deciduous tree (Populus tremuloides) having broadly ovate, finely toothed leaves with a truncate base.
- n. Populus tremuloides, the American aspen, so called from its leaves whose flattened petioles cause them to tremble in the breeze.
GNU Webster's 1913
- (Bot.) an American species of poplar (Populus tremuloides), the leaves of which tremble in the lightest breeze. It much resembles the European aspen. See Aspen.
- n. Old World aspen with a broad much-branched crown; northwestern Europe and Siberia to North Africa
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