|1.||pelecypod, Also: lamellibranch any marine or freshwater mollusc of the class Pelecypoda (formerly Bivalvia or Lamellibranchia), having a laterally compressed body, a shell consisting of two hinged valves, and gills for respiration. The group includes clams, cockles, oysters, and mussels|
|2.||pelecypod, Also: lamellibranch of, relating to, or belonging to the Pelecypoda|
|3.||biology Also: bivalvate having or consisting of two valves or similar parts: a bivalve seed capsule|
|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
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