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speakerphone /ˈspiːkɚˌfoʊn/  

  • noun
    plural -phones
    chiefly US :a feature on a telephone that allows you to talk and listen to someone without holding the receiver to your head [count]
    We used the speakerphone for the call so that everyone could hear what was said. [noncount]
    He put her on speakerphone so that everyone could hear what she said.