speak‧er‧phone /ˈspiːkəfəʊn $ -kərfoʊn/ noun [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.

[TahlilGaran] Dictionary of Contemporary English ▲