giant clam

noun
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).

Origin:
1945–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
giant clam

noun
a large clam inhabiting reefs in the southern Pacific and weighing up to 500 pounds 
WordNet® 3.0, © 2006 by Princeton University.
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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
  area.
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
  clam.
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