from The Century Dictionary.
- noun One of a series of ridges, with corresponding depressions, rising in wave-like succession above the general level of the snow when this has been blown across by a long-continued wind.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Any of a series of long, wavelike
ridgesor groovesformed on a snowsurface by the wind, especially in polar plains.
from Wiktionary, Creative Commons Attribution/Share-Alike License
From Russian заструга (zastruga)
The word is of Russian derivation (from zastruga [sing.], zastrugi