PlanorbisPla*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.|