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"

1. Medically unqualified
   "a quack doctor"

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