Hypertext Webster Gateway: "Physa"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Physa \Phy"sa\, n. [NL., fr. Gr. ? a bellows.] (Zo["o]l.)
A genus of fresh-water Pulmonifera, having reversed spiral
shells. See {Pond snail}, under {Pond}.
From WordNet (r) 1.7 (wn)
physa
n : any member of the genus Physa
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