The Collaborative International Dictionary of English v.0.48:

Quackery \Quack"er*y\, n.; pl. Quackeries.
   The acts, arts, or boastful pretensions of a quack; false
   pretensions to any art; empiricism. --Carlyle.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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