Etymology
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bivalve (adj.)

1660s in reference to mollusks with hinged double shells; 1670s in reference to shutters or doors having two folding parts; from bi- + valve. The noun is 1680s in the mollusk sense.

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Definitions of bivalve
1
bivalve (n.)
marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together;
Synonyms: pelecypod / lamellibranch
2
bivalve (adj.)
used of mollusks having two shells (as clams etc.);
Synonyms: bivalved
From wordnet.princeton.edu