Sheepback

• (n.) A rounded knoll of rock resembling the back of a sheep. -- produced by glacial action. Called also roche moutonnee; -- usually in the plural.
Found on http://thinkexist.com/dictionary/meaning/sheepback/

Sheepback

Sheep'back` noun (Geol.) A rounded knoll of rock resembling the back of a sheep. -- produced by glacial action. Called also roche moutonnée ; -- usually in the plural.
Found on http://www.encyclo.co.uk/webster/S/85
No exact match found