harmonica

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Music A small rectangular instrument consisting of a row of free reeds set back in air holes, played by exhaling or inhaling. Also called mouth harp, mouth organ; also called regionally French harp.
2. n. Music A glass harmonica.
3. n. Music An instrument consisting of tuned strips of metal or glass fixed to a frame and struck with a hammer.

Century Dictionary and Cyclopedia

1. n. Same as musical glasses (which see, under glass).
2. n. A musical toy consisting of a set of small metallic reeds so mounted in a case that they may be played by the breath, certain tones being produced by expiration, others by inhalation. Also called harmonicon.
3. n. In organ-building, a mixturestop.

Wiktionary

1. n. a musical wind instrument with a series of holes for the player to blow into, each hole producing a different note
2. n. a musical instrument, consisting of a series of hemispherical glasses which, by touching the edges with the dampened finger, give forth the tones.
3. n. a toy instrument of strips of glass or metal hung on two tapes, and struck with hammers.

GNU Webster's 1913

1. n. 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. n. A toy instrument of strips of glass or metal hung on two tapes, and struck with hammers.
3. n. A small wind musical instrument shaped like a flat bar with holes along the thin edges, held in the hand and producing notes from multiple vibrating reeds arranged inside along its length; it was formerly called the harmonicon. See harmonicon.

WordNet 3.0

1. n. 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