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

 

purist

 noun
noun
BrE BrE//ˈpjʊərɪst//
 
; NAmE NAmE//ˈpjʊrɪst//
 
 
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a person who thinks things should be done in the traditional way and who has strong opinions on what is correct in language, art, etc. Purists may not approve of the changes made to the text of the play in this production. Word Origin early 18th cent.: from French puriste, from pur ‘pure’.
See the Oxford Advanced American Dictionary entry: purist