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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
http://www.medicinenet.com/script/main/art.asp?articlekey=11814
Last Editorial Review: 8/28/2013

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