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mechanical instrument

noun
  1. a musical instrument, such as a barrel organ or music box, that plays a preselected piece of music by mechanical means
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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