SINCE 1828
physa
noun
phy·sa
| \ ˈfīsə\
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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