aspen

 
Pronunciation: /ˈasp(ə)n/

noun

  • a poplar tree with small rounded long-stalked leaves that tremble in the breeze.
    • Genus Populus, family Salicaceae: several species, in particular the European P. tremula and the North American quaking aspen (P. tremuloides)

Origin:

late Middle English: from dialect asp (in the same sense) + -en2, forming an adjective later used as a noun (late 16th century)