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

 

peephole

 noun
noun
BrE BrE//ˈpiːphəʊl//
 
; NAmE NAmE//ˈpiːphoʊl//
 
 
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a small opening in a wall, door, etc. that you can look through
See the Oxford Advanced American Dictionary entry: peephole