Source : Webster's Revised Unabridged Dictionary (1913)

Polychord \Pol"y*chord\, a. [Gr. ?; poly`s many + ? string,
   cord.]
   Having many strings.

Polychord \Pol"y*chord\, n. (Mus.)
   (a) A musical instrument of ten strings.
   (b) An apparatus for coupling two octave notes, capable of
       being attached to a keyed instrument.