snowdrift -
A bank of snow accumulated by the wind.
Wikipedia
A snowdrift is a deposit of snow created by wind into a mound during snowstorms. They resemble sand dunes and are formed in a similar manner, namely, by wind moving light snow and depositing it when the wind is slowed, usually against a stationary object. Snow normally crests and slopes off toward the surface on the windward side of a large object.
OmegaWiki Dictionary
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snowdrift A mound of snow accumulated by the wind.
