from the GNU version of the Collaborative International Dictionary of English

  • n. 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.

from The Century Dictionary and Cyclopedia

  • n. A genus of inequilateral equivalve bivalve mollusks, forming the type of the family Tridacnidæ.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. type genus of the family Tridacnidae: giant clams


Sorry, no etymologies found.


  • Researchers have discovered a new species of living giant clam, Tridacna costata, in the Red Sea.

    Archive 2008-08-01

  • Tridacnid calms such as crocus calm Tridacna crosea, giant clam T. gigas (VU), scaly calm T. squamosa (LR) and horse's hoof (Bear paw) clam Hippopus hippopus (LR) are found in some parts of the lagoon.

    Tubbataha Reef Marine Park, Philippines

  • Zooxanthellae are also found in other animals including some species of jellyfish and in giant clams (Tridacna spp.).


  • Recently, Tridacna was the subject of a post at A Snail's Eye View.

    Bivalve news

  • In fact, the only time I wrote about them may have been once about the largest of them all, Tridacna gigas and once about one of the tiniest, a Pisidium.

    Bivalve news

  • Further down were various shells, especially bénitiers (Tridacna gigantea) the harp (here called “Sirinbáz”), and the pearl-oyster; sheep-bones and palm charcoal; pottery admirably “cooked,” as the

    The Land of Midian

  • Amongst them is the monstrous Tridacna (gigantea), which sometimes attains a growth of

    The Land of Midian

  • Possibly the golden age of the pearl is passing as the golden age of the reptile has passed, for can it not be imagined that, in those far-back days when oysters attained a length of two feet and better deserved the title of Tridacna (three bites) than the present clams, pearls of corresponding magnificence of size were produced?

    Tropic Days

  • Several sites in the northern Moluccas, Talaud, and Admiralty Islands have a unique and rather impressive industry of adzes made from shells of large Tridacna and Hippopus clams at about the same date.

    Ancient Seafarers

  • The giant clam Tridacna displays a rapid growth rate and has demonstrated good potential for mariculture in the Caroline Islands.

    Chapter 3


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