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

 

nitpicker

 noun
noun
BrE BrE//ˈnɪtpɪkə(r)//
 
; NAmE NAmE//ˈnɪtpɪkər//
 
(informal, disapproving)
 
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a person who often finds small mistakes in somebody's work or pays too much attention to small details that are not important