snow roller
n.— «Stanford found frozen doughnuts of snow on the top of Washington Pass in the North Cascades this week when he was doing avalanche-control work. At first he couldn’t believe his eyes: Perfectly shaped doughnuts had rolled down the mountainside and frozen in place.…The larger of the snow rollers, as they are commonly called, was about 24 inches tall, he said, large enough for him to put his head through the hole.» —“A rare treat from nature: Perfect snow doughnuts” by Susan Gilmore Seattle Times (Washington) Mar. 17, 2006. (source: Double-Tongued Dictionary)
Further reading
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