giant clam

any of several huge clams of the family Tridacnidae, inhabiting the shallow waters of coral reefs in the tropical Indo-Pacific, as Tridacna gigas: some may weigh more than 500 pounds (225 kg).

1945–50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Several species, such as the giant clam, were used for cultural celebrations
  and events.
Turtle, whales, sharks and the giant clam all find refuge in this protected
Foreign commercial and local subsistence fisheries over exploiting the giant
  clam population is unfortunate.
One animal that has already been overfished from many coral reefs is the giant
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