Piano

n.
  1. 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.
    2. 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.