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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Tri·dac·na n.  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.
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From: WordNet (r) 2.0

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