Sierra cement
 n.— «The only vehicles allowed were gravel trucks and graders working to remove what is known as “Sierra cement,” the type of thick, clumpy snow that can play havoc with tire treads and drivers’ nerves.» —“Many Without Power Amid California Storm” by Jesse McKinley in San Francisco, California New York Times Jan. 6, 2008. (source: Double-Tongued Dictionary)

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