D defs.my
Entry 1 sense Webster, 1913

kazoo

/kəz-o͞o'/ · ka·zoo · IPA /kəˈzuː/
01 n. 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…
  1. 1.
    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.