Dictionary.com

piano roll

noun

a roll of paper containing perforations such that air passing through them actuates the keys of a player piano.

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seclusion
a false belief or opinion.
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Origin of piano roll

First recorded in 1925–30

Words nearby piano roll

piano nobile, piano player, piano quartet, piano quintet, piano reduction, piano roll, piano stool, piano trio, piano tuner, piano wire, Piarist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for piano roll

piano roll

noun

a perforated roll of paper actuating the playing mechanism of a PianolaAlso called: music roll
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012