bivalve

US /ˈbaɪ.vælv/
UK /ˈbaɪ.vælv/
"bivalve" picture
1.

an aquatic mollusc that has a compressed body enclosed between two hinged shells, e.g., an oyster or clam.

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The diver discovered a rare bivalve on the ocean floor.
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Oysters and clams are common examples of bivalves.
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clamoystermusselscallop
1.

having two valves or shells

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The scientist examined the bivalve structure of the ancient fossil.
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Many types of shells found on beaches are bivalve.