speaker phone

speakerphone

[spee-ker-fohn]
noun
a telephone or telephone attachment equipped with both loudspeaker and microphone, thus permitting the instrument to be used without being held.

Origin:
1955–60, Americanism; (loud)speaker + (micro)phone or (tele)phone

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World English Dictionary
speakerphone (ˈspiːkəˌfəʊn)
 
n
a telephone incorporating an external microphone and loudspeaker, allowing several people to participate in a call at the same time

Collins English Dictionary - Complete & Unabridged 10th Edition
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