{ Asp″en (ăs″pĕn), Asp (ȧsp), } n. [AS. æsp, æps; akin to OHG. aspa, Icel. ösp, Dan. æsp, Sw. asp, D. esp, G. espe, äspe, aspe; cf. Lettish apsa, Lith. apuszis.] (Bot.) One of several species of poplar bearing this name, especially the Populus tremula, so called from the trembling of its leaves, which move with the slightest impulse of the air.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.