a small musical instrument consisting of a lyre-shaped metal frame held between the teeth and played by plucking a projecting bent piece with the finger: it produces twanging tones
See jew's-harp in American Heritage Dictionary 4
or jew's harp(jo͞oz)
noun
A small musical instrument consisting of a lyre-shaped metal frame that is held between the teeth and a projecting steel tongue that is plucked to produce a soft twanging sound.