noun a fraudulent or ignorant pretender to medical skill. a person who pretends, professionally or publicly, to skill, knowledge, or qualifications he or she does not possess; a charlatan. adjective being a quack: a quack psychologist who complicates everyone's problems.

quack (kwăk) n. 1. An untrained person who pretends to be a physician and dispenses medical advice and treatment. 2. A charlatan; a mountebank. adj. Relating to or characteristic of a quack: a quack cure.

1. a fraudulent pretender to medical skill. 2. a person who pretends, professionally or publicly, to skill, knowledge, or qualifications he or she does not possess; a charlatan. adj. 3. being a quack: a quack psychologist. 4. of, pertaining to, or befitting a quack or quackery: quack methods; quack medicine.

A quack is a "fraudulent or ignorant pretender to medical skill" or "a person who pretends, professionally or publicly, to have skill, knowledge, qualification or credentials they do not possess; a charlatan or snake oil salesman". [2] The term quack is a clipped form of the archaic term quacksalver, from Dutch: ...

quack in American English (kwæk) noun 1. an untrained person who practices medicine fraudulently 2. any person who pretends to have knowledge or skill that he or she does not have in a particular field; charlatan