Noun genus tridacna has 1 sense
  1. Tridacna, genus Tridacna - type genus of the family Tridacnidae: giant clams
    --1 is a kind of mollusk genus
    --1 is a member of Tridacnidae, family Tridacnidae
    --1 has members: giant clam, Tridacna gigas
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