Hypertext Webster Gateway: "Planorbis"
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.
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