ark shell

Thesaurus

Noun

1.

ark shell - marine bivalve mollusk having a heavy toothed shell with a deep boat-like inner surfacebivalve, lamellibranch, pelecypod - marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged togetherArca, genus Arca - type genus of the family Arcidae: ark shells and blood clams