sastruga

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sas·tru·ga

(să-stro͞o′gə, săs′trə-, sä′strə-) also zas·tru·ga (ză-stro͞o′gə, zä-)
n. pl. sas·tru·gi (-gē) also zas·tru·gi
A long wavelike ridge of snow, formed by the wind and found on the polar plains.

[Russian dialectal zastruga : za, beyond + struga, deep place into which one may fall; see sreu- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

sastruga

(səˈstruːɡə; sæ-) or

zastruga

n
(Physical Geography) 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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014