Definitions for quaking aspen
Random House Webster's College Dictionary
an aspen, Populus tremuloides, with heart-shaped leaves that tremble in the wind.
Origin of quaking aspen:
quaking aspen, European quaking aspen, Populus tremula(noun)
Old World aspen with a broad much-branched crown; northwestern Europe and Siberia to North Africa
Populus tremuloides, the American aspen, so called from its leaves whose flattened petioles cause them to tremble in the breeze.
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