| NOUN | animal | ark shell | marine bivalve mollusk having a heavy toothed shell with a deep boat-like inner surface |
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| Meaning | marine bivalve mollusk having a heavy toothed shell with a deep boat-like inner surface. | |
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| Member of | Arca, genus Arca | type genus of the family Arcidae |
| Broader | bivalve, pelecypod, lamellibranch | marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together |
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