- A marine univalve shell regarding the genus Bulla and allied genera, from the Tectibranchiata molluscs.
- A shell of the family Bullidæ and genus Bulla, of an oval form, with the outermost whorl involving all the others. Species are numerous in tropical and warm seas. See cuts under Bulla.
- marine gastropod mollusk having a tremendously little slim layer
- A marine univalve layer regarding the genus Bulla and allied genera, of the Tectibranchiata.
Hypernym for "bubble shell"
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