Definitions for jew's harp
Random House Webster's College Dictionary
(or Jews'′ ) harp`
(sometimes l.c.) a small, simple musical instrument consisting of a lyre-shaped metal frame containing a metal tongue, which is plucked while the frame is held in the teeth, the vibrations causing twanging tones.
Category: Music and Dance
Origin of Jew's harp:
jew's harp, jews' harp, mouth bow(noun)
a small lyre-shaped musical instrument that is placed between the teeth and played by twanging a wire tongue while changing the shape of the mouth cavity
The Foolish Dictionary, by Gideon Wurdz
From Jew, a Hebrew, and Harp, a musical instrument, the Jew's musical instrument being a "Sell low!" (Old spelling, Cello).