An Etymological Dictionary of the German Language/Kruste
Kruste, f., ‘crust,’ from the rare MidHG. kruste, OHG. crusta, f., ‘crust’; a learned term which has been first naturalised in ModHG. Derived from Lat. crusta, whence also Du. korst, E. crust, as well as Rom. words like Fr. croûte.