from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A North American deciduous tree (Populus tremuloides) having broadly ovate, finely toothed leaves with a truncate base.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Populus tremuloides, the American aspen, so called from its leaves whose flattened petioles cause them to tremble in the breeze.
from the GNU version of the Collaborative International Dictionary of English
- an American species of poplar (Populus tremuloides), the leaves of which tremble in the lightest breeze. It much resembles the European aspen. See Aspen.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. Old World aspen with a broad much-branched crown; northwestern Europe and Siberia to North Africa
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