QUACK. One, who, without sufficient knowledge, study or previous preparation, and without the diploma of some college or university, undertakes to practice medicine or surgery, under the pretence that he possesses secrets in those arts.
2. He is criminally answerable for his unskillful practice, and also, civilly to his patient in certain cases. Vide Mala praxis; Physician.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.

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References in periodicals archive

However, the objective of quackish easing is economic recovery, which means that the central bank cannot proceed to the exit until the economy recovers.

Quantitative Easing or Quackish Easing?

Thus it was perfectly plausible around 1800 to represent smallpox vaccination as quackish balderdash, as when, in `The Cow-Pock', Gillray spoofed Jennerian variolation.

The Body Politic ~ Diseases and Discourses

Aromatherapy, once an obscure and slightly quackish activity, is now big business.

Therapeutic effects of tea aromas

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