01 n. pl. An earlier name for the class of Mollusca including all those that have bivalve shells, as the clams, oysters, mussels, etc., now called Pe…
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An earlier name for the class of Mollusca including all those that have bivalve shells, as the clams, oysters, mussels, etc., now called Pelecypoda or Bivalvia.(Zool.) Also: <class>Pelecypoda</class>, <class>Bivalvia</class>