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

 

deadbolt

 noun
noun
BrE BrE//ˈdedbəʊlt//
 
; NAmE NAmE//ˈdedboʊlt//
 
(especially North American English)(British English also deadlock)
 
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a type of lock on a door that needs a key to open or close it
See the Oxford Advanced American Dictionary entry: deadbolt

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