WordReference Random House Unabridged Dictionary of American English © 2026
pian′o roll′, 
  1. Music and Dancea roll of paper containing perforations such that air passing through them actuates the keys of a player piano.
  • 1925–30

Collins Concise English Dictionary © HarperCollins Publishers::
piano roll n
  1. a perforated roll of paper actuating the playing mechanism of a Pianola
'piano roll' also found in these entries (note: many are not synonyms or translations):
player piano

Forum discussions with the word(s) "piano roll" in the title:


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