Tristoma
Tristoma Tris"to*ma (tr[i^]s"t[-o]*m[.a]), n. [NL., from Gr. tri- (see {Tri-}) + sto`ma mouth.] (Zo["o]l.) 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. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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