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Noun: quack  kwak
Usage: informal
  1. An untrained person who pretends to be a physician and who dispenses medical advice
    "The quack sold fake cures to unsuspecting patients"
     
  2. The harsh sound of a duck
    "The quack of ducks could be heard from the pond"
Adjective: quack  kwak
Usage: informal
  1. Medically unqualified
    "a quack doctor"
Verb: quack  kwak
Usage: informal
  1. (medicine) act as a medical quack or a charlatan
    "The unlicensed practitioner quacked his way through the community, selling fake cures"
     
  2. Utter quacking noises
    "The ducks quacked"

Derived forms: quacking, quacks, quacked

See also: unqualified

Type of: acquit, act, bear, behave, carry, charlatan, comport, conduct, deport, do, doc [informal], doctor, Dr., emit, let loose, let out, MD, medico [informal], mountebank, physician, sawbones [informal], sound, utter

Encyclopedia: Quack, Martin