Definition of Svengali noun from the Oxford Advanced American Dictionary

 

Svengali

 noun
noun
NAmE//svɛnˈɡɑli//
 
, NAmE//sfɛnˈɡɑli//
 
 
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a person who has the power to control another person's mind, make them do bad things, etc. From the name of a character in George du Maurier's novel Trilby.
See the Oxford Advanced Learner's Dictionary entry: Svengali