plural of harmonica

A musical wind instrument with a series of holes for the player to blow into, each hole producing a different note

plural of glass harmonica

(music) A musical instrument composed of a series of spinning glass bowls, played with the fingers, invented by Benjamin Franklin. / (more loosely) The glass harp.

plural of harmonica bug

An electronic eavesdropping device (bug) that attaches to a landline telephone and is activated or deactivated by a specific tone. When activated, it prevents the telephone from ringing but activates its microphone to transmit to another telephone at a remote location.