Definition of Quack
Quack: 1) A practitioner who suggests the use of substances or devices for the prevention or treatment of disease that are known to be ineffective.
2) A person who pretends to be able to diagnose or heal people, but is unqualified and incompetent.Source: MedTerms™ Medical Dictionary
Last Editorial Review: 4/27/2011 5:27:15 PM
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