1. a small rectangular musical instrument played by blowing air through it while moving it across the lips

Examples

• He played a blues song on his harmonica.
• The harmonica is easy to carry in your pocket.
• She learned to play the harmonica when she was ten years old.
• The folk singer accompanied himself on harmonica.
• You can hear the harmonica’s distinctive sound in many country songs.
• He bought a new harmonica at the music store.