Sastruga

A sastruga or zastruga (collective noun: sastrugi or zastrugi) is a member of a body of sharp irregular grooves or ridges formed on a snow surface by wind erosion and deposition, and found in polar regions. They differ from sand dunes in that the ridges are parallel to the prevailing winds.

The word is a coinage from the Russian collective noun sastrugi/zastrugi.

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