| planorbis | <marine biology> Any fresh water air-breathing mollusk belonging to Planorbis and other allied genera, having shells of a discoidal form. Origin: NL, fr. L. Planus flat + orbis a circle. (19 Mar 1998) |
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| Planorbis |
a genus of snails of the family Planorbidae. Several species act as intermediate hosts for trematodes such as Schistosoma mansoni, Fasciolopsis buski, and species of Echinostoma.
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