Definition of quack

adjective (a)

• Pertaining to or characterized by, boasting and pretension; used by quacks; pretending to cure diseases; as, a quack medicine; a quack doctor. (adjective)

  source: webster1913

noun (n)

• an untrained person who pretends to be a physician and who dispenses medical advice (noun.person)

  source: wordnet30
• the harsh sound of a duck (noun.event)

  source: wordnet30
• The cry of the duck, or a sound in imitation of it; a hoarse, quacking noise. (noun)

  source: webster1913

adjective satellite (s)

• medically unqualified (adj.all)

  Example:
  A quack doctor.
  

  source: wordnet30

verb (v)

• utter quacking noises (verb.communication)

  Example:
  The ducks quacked.
  

  source: wordnet30
• act as a medical quack or a charlatan (verb.body)

  source: wordnet30
• To utter a sound like the cry of a duck. (verb)

  source: webster1913

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