Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Language: Greek
Origin: megas 'large' + phone 'voice, sound'

megaphone

 noun
     
megaphone
meg‧a‧phone [countable]
TPGO a piece of equipment like a large horn which you talk through to make your voice sound louder, when you are speaking to a crowd
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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