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Bivalve (noun)
Any mollusc belonging to the taxonomic class Bivalvia, characterized by a shell consisting of two hinged sections, such as a scallop, clam, mussel or oyster.
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Bivalve (noun)
A pericarp in which the seed case opens or splits into two parts or valves.
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Univalve (adjective)
having one valve; typically used to refer to mollusks, notably slugs and snails.
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Univalve (adjective)
consisting of a single valve or piece, used to refer to a shell.
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Univalve (noun)
A univalve mollusk or its shell.
Wiktionary