barrel organ

WordReference Random House Unabridged Dictionary of American English © 2025

bar′rel or′gan, 

1. Music and Dance a 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 noun

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
   See also hurdy-gurdy