Source : Webster's Revised Unabridged Dictionary (1913)

Jew's-harp \Jew's-harp`\, n. [Jew + harp; or possibly a corrupt.
   of jaw's harp; cf. G. maultrommel, lit., mouthdrum.]
   1. An instrument of music, which, when placed between the
      teeth, gives, by means of a bent metal tongue struck by
      the finger, a sound which is modulated by the breath; --
      called also {Jew's-trump}.

   2. (Naut.) The shackle for joining a chain cable to an
      anchor.