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as·pen

(aspən)

Any of various trees of the genus Populus having leaves that flutter readily in the wind because of their flattened leafstalks.

[Middle Englishaspe, fromOld Englishæspe.]

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aspen

quaking aspens

Populus tremuloides

As·pen

(ăspən)

A city of west-central Colorado west-southwest of Denver at the base of Aspen Mountain, a peak rising to 3,418 m (11,212 ft). Founded c. 1879 by silver prospectors, Aspen is a popular ski area and mountain resort.

Indo-European & Semitic Roots Appendices

Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

Indo-European Roots

Semitic Roots

The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.

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