[sas-truh-guh, sah-struh-, sa-stroo-, sah-]
noun, plural sastrugi [sas-truh-gee, sah-struh-, sa-stroo-, sah-] .
Usually, sastrugi. ridges of snow formed on a snowfield by the action of the wind.
Also, zastruga.

1830–40; < German < dialectal Russian zastrúga, noun derivative of zastrugátʾ, zastrogátʾ to plane, shave down (wood), equivalent to za- perfective v. prefix + strugátʾ, strogátʾ to plane, smooth (wood) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sastruga or zastruga (səˈstruːɡə, sæ-)
one of a series of ridges on snow-covered plains, caused by the action of wind laden with ice particles
[from Russian zastruga groove, from za by + struga deep place]
zastruga or zastruga
[from Russian zastruga groove, from za by + struga deep place]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
sastrugi (sā-str'gə, sä'strə-) also zastrugi   (sā-str'gə, sä'strə-)
Long, wavelike ridges of snow, formed by the wind and found on the polar plains. Sastrugi are usually up to several meters high and are often parallel to the prevailing wind direction.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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