'kazoo' definitions:

Definition of 'kazoo'

From: WordNet
noun
A toy wind instrument that has a membrane that makes a sound when you hum into the mouthpiece

Definition of 'kazoo'

From: GCIDE
  • kazoo \ka*zoo"\, n. [Etymol. uncertain.] 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. [Webster 1913 Suppl.]

Definition of 'kazoo'

From: GCIDE
  • Mirliton \Mir"li*ton\, n. [F.]
  • 1. A kind of musical toy into which one sings, hums, or speaks, producing a coarse, reedy sound. It is also called a kazoo. [Webster 1913 Suppl. +PJC]
  • Trilby singing "Ben Bolt" into a mirliton was a thing to be remembered, whether one would or no! --Du Maurier. [Webster 1913 Suppl.]
  • 2. same as chayote[2]. [PJC]