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1. An untrained person who pretends to be a physician and who dispenses medical advice
    
2. The harsh sound of a duck

1. Medically unqualified
   "a quack doctor"

1. Utter quacking noises
   "The ducks quacked"
    
2. Act as a medical quack or a charlatan

Derived forms: quacks, quacked, quacking

See also: quackery, unqualified

Type of: act, behave, charlatan, do, doc, doctor, Dr., emit, let loose, let out, MD, medico, mountebank, physician, sound, utter

Encyclopedia: Quack