Etymology
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quackery (n.)

"the boastful pretensions or knavish practice of a quack, particularly in medicine" [Century Dictionary], 1690s, from quack (n.1) + -ery.

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Definitions of quackery

quackery (n.)
medical practice and advice based on observation and experience in ignorance of scientific findings;
Synonyms: empiricism
quackery (n.)
the dishonesty of a charlatan;
Synonyms: charlatanism
From wordnet.princeton.edu