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(trs"tm), n.[NL., from Gr. tri- (see Tri-) + sto°ma mouth.] (Zol.) 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. スポンサード リンク
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