Pentecost
‘a Jewish festival on the fiftieth day after the Passover’
Lexical development traced from Tamil root:
E. pentecosten,pentycoste,penthecoste,pentycost < O.E. pentecosten‘Christian festival on seventh Sunday after Easter’ <La.Lat. pentecoste< Gk. pentekostē(hēmera) ‘fiftieth (day)’ < pentekonta ‘fifty’ <pente ‘five’ < Tamil aintu