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

 

loudhailer

 noun
noun
BrE BrE//ˌlaʊdˈheɪlə(r)//
 
; NAmE NAmE//ˌlaʊdˈheɪlər//
 
(British English)(North American English bullhorn)
 
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an electronic device, shaped like a horn, with a microphone at one end, that you speak into in order to make your voice louder so that it can be heard at a distance compare megaphone

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