Aspen \Asp"en\ ([a^]s"p[e^]n), Asp \Asp\ ([.a]sp), n. [AS.
[ae]sp, [ae]ps; akin to OHG. aspa, Icel. ["o]sp, Dan. [ae]sp,
Sw. asp, D. esp, G. espe, ["a]spe, 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.
Source: Webster's Revised Unabridged Dictionary (1913)
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