Noun family unionidae has 1 sense
  1. Unionidae, family Unionidae - freshwater mussels found worldwide
    --1 is a kind of mollusk family
    --1 is a member of
     Bivalvia, class Bivalvia, Lamellibranchia, class Lamellibranchia, class Pelecypoda
    --1 has members:
     Unio, genus Unio; Anodonta, genus Anodonta; Dreissena, genus Dreissena
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