Source : Webster's Revised Unabridged Dictionary (1913)

Polystome \Pol"y*stome\, a. [Gr. ? many-mouthed; poly`s + sto`ma
   mouth.] (Zo["o]l.)
   Having many mouths.

Polystome \Pol"y*stome\, n. (Zo["o]l.)
   An animal having many mouths; -- applied to Protozoa.