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The Collaborative International Dictionary
Sheepback

Sheepback \Sheep"back`\, n. (Geol.) A rounded knoll of rock resembling the back of a sheep. -- produced by glacial action. Called also roche moutonn['e]e; -- usually in the plural.

Wiktionary
sheepback

n. (context glaciology English) A rock formation created by the passing of a glacier.