harmonica Meaning, Definition & Usage

  1. noun a small rectangular free-reed instrument having a row of free reeds set back in air holes and played by blowing into the desired hole
    harp; mouth organ; mouth harp.

WordNet

Har*mon"i*ca noun
Etymology
Fem. fr. L. harmonicus harmonic. See Harmonic, n.
Definitions
  1. A musical instrument, consisting of a series of hemispherical glasses which, by touching the edges with the dampened finger, give forth the tones. NOTE: This is now called the "Glass harmonica". The modern hand instrument has reeds
  2. A toy instrument of strips of glass or metal hung on two tapes, and struck with hammers.

Webster 1913