Pronunciation: (här-mon'i-ku), [key]
1. Also called mouth organ. a musical wind instrument consisting of a small rectangular case containing a set of metal reeds connected to a row of holes, over which the player places the mouth and exhales and inhales to produce the tones.
2. any of various percussion instruments that use graduated bars of metal or other hard material as sounding elements.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.