The Collaborative International Dictionary of English v.0.48:

Quacksalver \Quack"sal*ver\, n. [D. kwakzalver; cf. kwakzalven
   to quack or boast of one's salves. See Quack, Salve, n.]
   One who boasts of his skill in medicines and salves, or of
   the efficacy of his prescriptions; a charlatan; a quack; a
   mountebank. [Obs.] --Burton.
   [1913 Webster] Quad