Definition of heterodox adjective from the Oxford Advanced Learner's Dictionary

 

heterodox

 adjective
adjective
BrE BrE//ˈhetərədɒks//
 
; NAmE NAmE//ˈhetərədɑːks//
 
(formal)
 
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not following the usual or accepted beliefs and opinions compare orthodox, unorthodox Word Origin early 17th cent. (originally as a noun denoting an unorthodox opinion): via late Latin from Greek heterodoxos, from heteros ‘other’ + doxa ‘opinion’.
See the Oxford Advanced American Dictionary entry: heterodox