Source : Webster's Revised Unabridged Dictionary (1913)

Distoma \Dis"to*ma\, n. [NL., fr. Gr. di- = di`s- twice + ?
   mouth.] (Zo["o]l.)
   A genus of parasitic, trematode worms, having two suckers for
   attaching themselves to the part they infest. See 1st
   {Fluke}, 2.