1. [ noun ] (medicine,work) an untrained person who pretends to be a physician and who dispenses medical advice
Related terms: doctor mountebank
2. [ adjective ] medically unqualified

"a quack doctor"

Related terms: unqualified
3. [ verb ] utter quacking noises

"The ducks quacked"

Related terms: utter
4. [ verb ] act as a medical quack or a charlatan
Related terms: act medicine
5. [ noun ] the harsh sound of a duck
Related terms: sound
Similar spelling:   quick