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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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Finally, the data was used to create simulations of Daisy performing at the Royal Albert Hall and quacking as she flew past a cliff face.
First Daisy was recorded quacking in an anechoic chamber -a special room with jagged surfaces that produces no sound reflections.
A jamaquack moves only backward, bent over, while always and forever quacking in its native tongue.