Planorbis
Pla*nor"bis\, n. [NL., fr. L. planus flat + orbis a circle.] (Zo["o]l.) Any fresh-water air-breathing mollusk belonging to Planorbis and other allied genera, having shells of a discoidal form.| a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
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