noun.
A toy musical instrument with a membrane that produces a buzzing sound when a player hums or sings into the mouthpiece.
The Century Dictionary and Cyclopedia
noun.
A so-called musical instrument or toy, consisting of a wooden tube of peculiar shape, containing a vibrating strip of catgut.
the GNU version of the Collaborative International Dictionary of English
noun.
A kind of toy or rude musical instrument, as a tube inside of which is a stretched string or membrane made to vibrate by singing or humming into the tube.