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Definitions of quack:
  • noun:   the harsh sound of a duck
  • noun:   an untrained person who pretends to be a physician and who dispenses medical advice
  • verb:   utter quacking noises
    Example: "The ducks quacked"
  • verb:   act as a medical quack or a charlatan

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Search for quack at other dictionaries: OneLook, Oxford, American Heritage, Merriam-Webster, Wikipedia

See quack used in context: 5 rhymes, several books and articles.

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