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

 

iconoclast

 noun
noun
BrE BrE//ˈkɒnəklæst//
 
; NAmE NAmE//ˈkɑːnəklæst//
 
(formal)
 
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a person who criticizes popular beliefs or established customs and ideas Word Origin mid 17th cent. (originally referring to someone who destroyed images used in religious worship): via medieval Latin from ecclesiastical Greek eikonoklastēs, from eikōn ‘likeness’ + klan ‘to break’.
See the Oxford Advanced American Dictionary entry: iconoclast