Definition of quack

Definition of quack
  1. quack Noun The sound made by a duck.
  2. quack Verb To make a noise like a duck.
  3. quack Noun A fraudulent healer or incompetent doctor of medicine, an impostor who claims to have qualifications to practice medicine.
  4. quack Noun A charlatan. "
  5. quack Noun A doctor.
  6. quack Verb To practice, commit quackery.
  7. quack Adjective falsely presented as having medicinal powers.
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