Definition of physa
1a capitalized : a widely distributed genus (the type of the family Physidae) of freshwater air-breathing snails, having a sinistral, ovate, usually rather short-spired shell and slender nonretractile tentacles with the eyes at their bases b plural -s : any snail of the genus Physa
2 plural physae \-ˌsē, -ˌsī\ also physas : the lower often retractile part of the body of some anthozoans
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Origin and Etymology of physa
New Latin, from Greek physa bellows — more at pustule
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