Definition of ad blocker noun from the Oxford Advanced Learner's Dictionary

 

ad blocker

 noun
noun
BrE BrE//ˈæd blɒkə(r)//
 
; NAmE NAmE//ˈæd blɑːkər//
 
 
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a piece of software that removes the advertisements from a web page when you view it Widespread use of ad blockers could pose a threat to the way many websites are currently funded.