An Etymological Dictionary of the German Language/Knollen

by Friedrich Kluge

Knollen, m., ‘clod, bulb,’ from MidHG. knolle, m., ‘clod, lump’; OHG. *chnollo, m., is wanting. With the MidHG. meaning are connected AS. cnoll, m., E. knoll; Du. knol, ‘turnip.’