'Upright piano' definitions:

Definition of 'upright piano'

From: WordNet
noun
A piano with a vertical sounding board [syn: upright, upright piano]

Definition of 'Upright piano'

From: 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]