Pi·an·o Pi·an·o·for·te n.  Mus. A well-known musical instrument somewhat resembling the harpsichord, and consisting of a series of wires of graduated length, thickness, and tension, struck by hammers moved by keys.
  Dumb piano. See Digitorium.
  Grand piano. See under Grand.
  Square piano, one with a horizontal frame and an oblong case.
  Upright piano, one with an upright frame and vertical wires.
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  upright piano
       n : a piano with a vertical sounding board [syn: upright]