单词	physa
释义	physa noun phy·​sa ˈfīsə 1 a 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 Word History Etymology New Latin, from Greek physa bellows
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