Source : Webster's Revised Unabridged Dictionary (1913)

Charlatan \Char"la*tan\, n. [F. charlatan, fr. It. ciarlatano,
   fr. ciarlare to chartter, prate; of imitative origin; cf. It.
   zirlare to whistle like a thrush.]
   One who prates much in his own favor, and makes unwarrantable
   pretensions; a quack; an impostor; an empiric; a mountebank.

Source : WordNet®

charlatan
     n : a flamboyant deceiver; one who attracts customers with
         tricks or jokes [syn: {mountebank}]