The Collaborative International Dictionary of English v.0.48:

Charlatanism \Char"la*tan*ism\, n. [Cf. F. charlatanisme.]
   Charlatanry.
   [1913 Webster]

WordNet (r) 3.0 (2006):

charlatanism
    n 1: the dishonesty of a charlatan [syn: charlatanism,
         quackery]