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planorbis |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: 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