An Etymological Dictionary of the German Language/Steiß
Appearance
Steiß, m., ‘rump, buttocks’ (with MidG. ei instead of eu), from the equiv. MidHG. and OHG. stī̆uz (hence also the early ModHG. variant Steuß), m., corresponding to Du. stuit. It is probably based on a Teut. stī̆wot-, which is primit. allied to Lat. stîva, ‘plough handle.’