Loudspeaker (noun)

1. An electroacoustic device that converts electrical signals into sound and projects it into the air.
2. A device that amplifies sound and broadcasts it through a loudspeaker.

Origin:

Early 20th century: from loud + speaker.

Examples:

1. The loudspeaker system in the stadium was powerful and clear.
2. He used a loudspeaker to address the crowd.
3. The loudspeaker on the telephone was not working properly.
4. The loudspeaker in the conference room was used to amplify the speaker's voice.
5. He used a loudspeaker to make announcements on the train.