acoustic guitar acoustic guitar /əˈkuːstɪk ɡɪˈtɑr/

noun

1. Sound is not amplified by electrical means  ( acoustic guitar )
   sound is not amplified by electrical means
    At the campfire, he played an old ballad on his acoustic guitar, captivating everyone.
   At the campfire, he played an old ballad on his acoustic guitar, captivating everyone.