Tristoma
Pronunciation : Tris"to*ma
Part of Speech : n.
Etymology : [NL., from Gr. Tri-) + (Zo?l.)
Definition : Defn: Any one of numerous species of trematode worms belonging to Tristoma and allied genera having a large posterior sucker and two small anterior ones. They usually have broad, thin, and disklike bodies, and are parasite on the gills and skin of fishes.
Source : Webster's Unabridged Dictionary, 1913