Definition of: harmonica

(här·mon′i·kə) noun
1. A musical instrument consisting of small metal reeds fixed within a series of slots in a narrow case, and played by blowing through the slots.
2. An instrument composed of a series of glass tubes, goblets, or the like, graduated to a musical scale and played by rubbing the rims.
3. An instrument composed of glass or metal strips struck by hammers. [<L, fem. of harmonicus harmonic]