quack(redirected from quackish)
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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.