Webster's English Dictionary

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loon

1. loon \'lu:n\ n [ME loun] 1: IDLER, LOUT  chiefly Scot  2a: MISTRESS, 
   HARLOT  2b: BOY  3a: a crazy person  3b: SIMPLETON 
2. loon n [of Scand origin; akin to ON lo-mr loon - more at LAMENT] : any 
   of several large fish-eating diving birds (genus Gavia) of the  northern 
   part of the northern hemisphere