aspen (n.)

European tree of the poplar family, late 14c., from adjectival or genitive form of Old English æspe "aspen tree, white poplar," from Proto-Germanic *aspo, adjective aspin- (source also of Old Norse ösp, Middle Dutch espe, Old High German aspa, German Espe), from PIE *apsā- "aspen" (source also of Lithuanian epušė, Latvianapsa, Old Prussianabse, Russianosina), 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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