Pronunciation: (kwak),[key] —n. the harsh, throaty cry of a duck or any similar sound.
—v.i. to utter the cry of a duck or a sound resembling it.
Pronunciation: (kwak),[key] —n. 1. a fraudulent or ignorant 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. 1. being a quack: a quack psychologist who complicates everyone's problems. 2. presented falsely as having curative powers: quack medicine. 3. of, pertaining to, or befitting a quack or quackery: quack methods.
—v.t. 1. to treat in the manner of a quack.
2. to advertise or sell with fraudulent claims.