Webster's English Dictionary

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quack

1. quack \'kwak\ vi [imit.] : to make the characteristic cry of a duck 
2. quack n : a noise made by quacking 
3. quack \-ish\ n [short for quacksalver] 1: a pretender to medical skill  
   2: CHARLATAN  - quack.ish aj
4. quack vi : to play the quack 
5. quack aj : of, relating to, or characteristic of a quack; esp : 
   pretending  to cure diseases