bubble shell

noun
variants: or bubble snail

Definition of bubble shell 

1 : any of a number of marine gastropod mollusks (order Opisthobranchia) having the shell comparatively thin and small with the body whorl enveloping the other whorls (such as members of the Akeridae or of the genus Bulla) — see haminoea

2 : a freshwater snail of Physa or a related genus

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