An Etymological Dictionary of the German Language/Läufel

by Friedrich Kluge

Läufel, Lauft, ‘shell’ (espec. nutshell), a Hess. and Franc. word, corresponding to OHG. louft, ‘nutshell, bark of trees.’ Prim. cognate with Lith. lupinai, ‘peel, skins of fruit’ (lùpti, ‘to skin, peel’), Pol. lupina, ‘husk,’