a mechanically operated piano that uses a roll of perforated paper to activate the keys
A pianola is a type of mechanical piano. When you press the pedals, air is forced through holes in a roll of paper to press the keys and play a tune. a piano that is played by machinery inside it. A long roll of paper with holes cut in it gradually turns and works the machinery, pressing down the keys on the piano to produce music = player piano (Pianola, a trademark)