lunatic
‘insanity caused by moon rays’
Lexical development traced from the Tamil root:
E. loonatic, lunaticke, lunatique, lunatic, lunatyke, lunatijc, lymatyke < O.F. lunatique ‘insane’ < La.Lat. lunaticus ‘moon-struck’ < Lat. luna ‘moon, goddess of the moon’ < leuksna- < loo < leuk- < Tamil el