| tristoma | <zoology> 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. Origin: NL, from Gr. (see Tri-) + mouth. Source: Websters Dictionary (01 Mar 1998) |
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