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1610s, from French charlatan "mountebank, babbler" (16c.), from Italian ciarlatano "a quack," from ciarlare "to prate, babble," from ciarla "chat, prattle," perhaps imitative of ducks' quacking. Related: Charlatanism; charlatanical; charlatanry.
charlatan char·la·tan (shär'lə-tən)
A person fraudulently claiming knowledge and skills not possessed.