Etymology
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aspen (n.)

European tree of the poplar family, late 14c., from adjectival or genitive form of Old English spe "aspen tree, white poplar," from Proto-Germanic *aspo, adjective aspin- (source also of Old Norse sp, Middle Dutch espe, Old High German aspa, German Espe), from PIE *aps- "aspen" (source also of Lithuanian epu, Latvian apsa, Old Prussian abse, Russian osina), perhaps a northern European substratum word. The current form in English probably arose from phrases such as aspen leaf, aspen bark (see -en (2)). Its leaves have been figurative of tremulousness and quaking at least since early 15c. (an Old English name for it was cwicbeam, literally "quick-tree").

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Definitions of aspen

aspen (n.)
any of several trees of the genus Populus having leaves on flattened stalks so that they flutter in the lightest wind;
From wordnet.princeton.edu