One of the mysteries of the English language finally explained.
A small freshwater snail of the genus Physa or family Physidae, having a thin, sinistral shell; (in form Physa) the genus itself.
Mid 19th century; earliest use found in Henry McMurtrie (1793–1865). From scientific Latin Physa, genus name from ancient Greek ϕῦσα bellows, probably from the same Indo-European base as classical Latin pustula.
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