‖Pla‐nor″bis (?), n. [NL., fr. L. planus flat + orbis a circle.] (Zoöl.) Any fresh-water air-breathing mollusk belonging to Planorbis and other allied genera, having shells of a discoidal form.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.