sastruga

noun sas·tru·ga \ˈsas-trə-gə, ˈsäs-; ˌsas-ˈtrü-gə, ˌsäs-\

plural sas·tru·gi \-(ˌ)gē\

Definition of SASTRUGA

: a wavelike ridge of hard snow formed by the wind —usually used in plural

German, from Russian dialect (Siberia) zastruga

First Known Use: 1840

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