loudhailer
Longman Dictionary of Contemporary English 5++LDOCE 5++loud·hail·er /ˌlaʊdˈheɪlə $ -ər/ noun [countable] 
British EnglishTC a piece of equipment with a microphone, that you can hold in your hand and speak through to make your voice louder 电子喇叭，扩音器 SYN megaphone, American English bullhorn
British EnglishTC a piece of equipment with a microphone, that you can hold in your hand and speak through to make your voice louder 电子喇叭，扩音器 SYN megaphone, American English bullhornExamples from the Corpus
loudhailer• Her reverie was broken by the sound of a loudhailer coming from the street.• The attackers then called by loudhailer on those in the house to surrender.• The organizers, loudhailers in hand, were corralling the crowd into marching formation when the first group of skinheads appeared.loud·hail·er nounChineseSyllable
equipment of with a Corpus piece a
loudhailer
loud‧hail‧er /ˌlaʊdˈheɪlə $ -ər/
noun [countable]
British English a piece of equipment with a microphone, that you can hold in your hand and speak through to make your voice louder
SYN megaphone, bullhorn American English
loud‧hail‧er /ˌlaʊdˈheɪlə $ -ər/
noun [countable]British English a piece of equipment with a microphone, that you can hold in your hand and speak through to make your voice louder
SYN megaphone, bullhorn American English