A piano having the strings mounted vertically in a rectangular case with the keyboard at a right angle to the case. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "upright piano" in a sentence
"To the right of that platform he had sat at the upright piano presented by Miss Doncaster and played his first solo, The Merry Peasant, with leaden fingers and a growing conviction that he was going to be sick."
"Menolly sat atop the upright piano in the corner, shooting nasty looks in Trillian's direction."