ventifact

ventifact

[ven-tuh-fakt]
noun Geology.
a pebble or cobble that has been faceted, grooved, and polished by the erosive action of wind-driven sand.

Origin:
1910–15; < Latin venti- (combining form of ventus wind1) + factum something made (see fact); perhaps modeled on artifact

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Collins
World English Dictionary
ventifact (ˈvɛntɪˌfækt)
 
n
geology a pebble that has been shaped by wind-blown sand

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
ventifact   (věn'tə-fākt')  Pronunciation Key 
A rock or pebble that has been shaped, polished, or faceted by wind-driven sand.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

ventifact

stone that has received one or more highly polished, flattened facets as a result of erosion by windblown sand. The facets are cut in sequence and correlate with the dominant wind direction. As one surface is cut, the stone may become out of balance and may turn to expose another surface to the wind. A ventifact that has been eroded to three curved facets is called a dreikanter. Ventifacts are produced under arid conditions and are generally formed from hard, fine-grained rocks such as obsidian, chert, or quartzite.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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