An Etymological Dictionary of the German Language/Scheide
Scheide, f., ‘sheath,’ from MidHG. scheide, OHG. sceida, f., ‘scabbard’; comp. OSax. scéðia, f., Du. scheede, f., AS. sčœ̂ð, f., E. sheath, OIc. skeiðer (plur.), ‘sheath’; Goth. *skaiþi (from skaitî), f., ‘sheath,’ is wanting (the term used being fôdr, n., ‘sheath,’ see Futteral). Allied to scheiden, hence lit. ‘separation, the separating covering’?. ModHG. Scheide, ‘separation, parting,’ is the same word; comp. MidHG. scheide, f., ‘separation, severing, departure, distinction, boundary’; OHG. sceida.