Jew's harp

or Jews' harp

noun
  1. (sometimes lowercase) 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.

Origin of Jew's harp

First recorded in 1585–95; perhaps jocular; earlier called Jew's trump
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for jew's-harp

jew's-harp

noun
  1. a musical instrument consisting of a small lyre-shaped metal frame held between the teeth, with a steel tongue plucked with the finger. Changes in pitch are produced by varying the size of the mouth cavities
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012