WordReference Random House Unabridged Dictionary of American English © 2020
barrel or′gan, 
  • Music and Dancea musical instrument in which air from a bellows is admitted to a set of pipes by means of pins inserted into a revolving barrel;
    hand organ.
    • 1765–75

    Collins Concise English Dictionary © HarperCollins Publishers::
    barrel organ n
    1. an instrument consisting of a cylinder turned by a handle and having pins on it that interrupt the air flow to certain pipes, thereby playing any of a number of tunes
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