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piano roll

noun
1.
a roll of paper containing perforations such that air passing through them actuates the keys of a player piano.
Origin
1925-1930
1925-30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for piano-roll

piano roll

noun
1.
a perforated roll of paper actuating the playing mechanism of a Pianola Also 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
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