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

 

demagogue

 noun
noun
BrE BrE//ˈdeməɡɒɡ//
 
; NAmE NAmE//ˈdeməɡɑːɡ//
 
(disapproving)
 
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a political leader who tries to win support by using arguments based on emotion rather than reason Word Origin mid 17th cent.: from Greek dēmagōgos, from dēmos ‘the people’ + agōgos ‘leading’ (from agein ‘to lead’).
See the Oxford Advanced American Dictionary entry: demagogue