What is the meaning of Harmonica?

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

A musical instrument, consisting of a series of hemispherical glasses which, by touching the edges with the dampened finger, give forth the tones.

A toy instrument of strips of glass or metal hung on two tapes, and struck with hammers.

harmonica, mouth harp (portable wind instrument)

harmonica, glass harmonica (musical instrument made from hemispherical glasses)

harmonica

Source: wiktionary.org