Definition of charlatan noun from the Oxford Advanced Learner's Dictionary

 

charlatan

 noun
noun
BrE BrE//ˈʃɑːlətən//
 
; NAmE NAmE//ˈʃɑːrlətən//
 
 
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a person who claims to have knowledge or skills that they do not really have He knows nothing about medicine—he’s a complete charlatan. Word Origin early 17th cent. (denoting a travelling seller of supposed remedies): from French, from Italian ciarlatano, from ciarlare ‘to babble’.
See the Oxford Advanced American Dictionary entry: charlatan