Source : Webster's Revised Unabridged Dictionary (1913)

Quackery \Quack"er*y\, n.; pl. {Quackeries}.
   The acts, arts, or boastful pretensions of a quack; false
   pretensions to any art; empiricism. --Carlyle.

Source : WordNet®

quackery
     n 1: medical practice and advice based on observation and
          experience in ignorance of scientific findings [syn: {empiricism}]
     2: the dishonesty of a charlatan [syn: {charlatanism}]