| tridacna | <zoology> A genus of very large marine bivalve shells found on the coral reefs of the Indian and Pacific Oceans. One species (T. Gigas) often weighs four or five hundred pounds, and is sometimes used for baptismal fonts. Synonym: paw shell, and fountain shell. Origin: L, pl, a kind of oysters, fr. Gr. Eaten at three bites, tri- + to bite. Source: Websters Dictionary (01 Mar 1998) |
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