sheath
‘a case for a sword or other implement, case, scabbard’
Lexical development traced from the Tamil root:
E. sceǽð, scaþ, scheth, sheathe < M.E. shethe ‘close-fitting case or covering for a blade’ < O.E. sceaþ, scæþ < Proto-G. skaith- < sheeth < skei- < Tamil kappu