Webster's English Dictionary

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lunatic

lu.na.tic \'lu:-n*-.tik\ aj [ME lunatik, fr. OF or LL; OF lunatique, fr. LL 
   lunaticus, fr]. L luna; fr. the belief that lunacy fluctuated with the 
   phases of the moon 1a: affected with lunacy : INSANE  1b: designed for the 
   care of insane persons {~ asylum}  2: wildly foolish : GIDDY  - lunatic n