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Definition of Physa
1. Noun. Any member of the genus Physa. 
Definition of Physa
1. n. A genus of fresh-water Pulmonifera, having reversed spiral shells. See Pond snail, under Pond.
Medical Definition of Physa
1. 
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1. Noun. Any member of the genus Physa. 
1. n. A genus of fresh-water Pulmonifera, having reversed spiral shells. See Pond snail, under Pond.
1.