speak ‧ er ‧ phone /ˈspiːkəfəʊn $ -kərfoʊn/ BrE AmE 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.