Planorbis is a genus of air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Planorbidae, the ram`s horn snails, or planorbids. All species in this genus have sinistral or left-coiling shells. == Description == Planorbis shells are flat-coiled and sinistral. == Distribution == This genus has a worldwide distribution....
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http://en.wikipedia.org/wiki/Planorbis
• (n.) Any fresh-water air-breathing mollusk belonging to Planorbis and other allied genera, having shells of a discoidal form.
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http://thinkexist.com/dictionary/meaning/planorbis/
(from the article `gastropod`) Snails show a tremendous variety of shapes, based primarily upon the logarithmic spiral. They can be coiled flatly in one plane, as in Planorbis; ...
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http://www.britannica.com/eb/a-z/p/76
<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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http://www.encyclo.co.uk/local/20973
Pla·nor'bis noun [ New Latin , from Latin
planus flat +
orbis a circle.]
(Zoology) Any fresh-water air-breathing mollusk belonging to
Planorbis and other allied genera, having shells of a discoidal form.
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http://www.encyclo.co.uk/webster/P/101
Type: Term Pronunciation: plan-ōr′bis Definitions: 1. A European and North African genus of freshwater snails (family Planorbidae), including Planorbis planorbis, intermediate host of the sheep and cattle fluke, Paramphistoma cervi.
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http://www.medilexicon.com/medicaldictionary.php?t=69369
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