vibraharp n a percussion instrument similar to a xylophone but having metal bars and rotating disks in the resonators that produce a vibrato sound Usage(s) Instead there was a clean, nearly transparent sound made by piano, vibraharp, bass and drum. Her talent: she played the vibraharp. And so she usually went, as full of creamy sweetness as a marshmallow sundae, still tingling from her exertions on the vibraharp. Synonym(s) vibraphone vibes