Sentence:  That 's why the FDA , the American Medical Association ( AMA ) , and the National Better Business Bureau ( BBB ) have estimated the toll of mechanical quackery to be a substantial portion of the $ 610 <WSD>million</WSD> or so paid to medical charlatans annually . 
Meaning of the word marked with <WSD> tags:  the number that is represented as a one followed by 6 zeros