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The Collaborative International Dictionary of English v.0.48 (gcide)

Piano \Pi*an"o\, Pianoforte \Pi*an"o*for`te\, n. [It. piano soft
(fr. L. planus even, smooth; see {Plain}, a.) It. forte
strong, fr. L. fortis (see {Fort}).] (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.
[1913 Webster]

{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.
[1913 Webster]