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2 definitions found
 for Tridacna
From The Collaborative International Dictionary of English v.0.48 :

  Tridacna \Tri*dac"na\, n. [L., pl., a kind of oysters, fr. Gr. ?
     eaten at three bites, ? tri- + ? to bite.] (Zool.)
     A genus of very large marine bivalve shells found on the
     coral reefs of the Indian and Pacific Oceans. One species
     ({Tridacna gigas) often weighs four or five hundred pounds,
     and is sometimes used for baptismal fonts. Called also paw
     shell, and fountain shell.
     [1913 Webster] Tridactyl

From WordNet (r) 3.0 (2006) :

      n 1: type genus of the family Tridacnidae: giant clams [syn:
           Tridacna, genus Tridacna]

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