Longman Dictionary of Contemporary English homepage

speakerphone

 noun
     
speak‧er‧phone [countable] especially American English
a telephone that contains a microphone and a loudspeaker, so that you can use it without holding it. Speakerphones are especially used in business meetings when groups of people in different places want to talk to each other.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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