Definify.com
Webster 1913 Edition
Harmonica
1.
A musical instrument, consisting of a series of hemispherical glasses which, by touching the edges with the dampened finger, give forth the tones; it is now called the
glass harmonica
, to distinguish it from the common harmonica, formerly called the harmonicon. 2.
A toy instrument of strips of glass or metal hung on two tapes, and struck with hammers.