Sentence:  That 's why the FDA , the American Medical Association ( AMA ) , and the National Better Business Bureau ( BBB ) have estimated the toll of mechanical <WSD>quackery</WSD> to be a substantial portion of the $ 610 million or so paid to medical charlatans annually . 
Meaning of the word marked with <WSD> tags:  medical practice and advice based on observation and experience in ignorance of scientific findings