TRISTOMA
\tɹɪstˈə͡ʊmə], \tɹɪstˈəʊmə], \t_ɹ_ɪ_s_t_ˈəʊ_m_ə]\
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Any one of numerous species of trematode worms belonging to 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.
By Noah Webster.
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Snake's-head
- Guinea-hen flower; -- so called in England because its spotted petals resemble the scales of a snake's head.