Definitions of coral reef
a reef consisting of coral consolidated into limestone
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Great Barrier Reef
the largest coral reef in the world; in the Coral Sea off the northeastern coast of Australia
an atoll in the Marshall Islands; formerly used by the United States as a site for testing nuclear weapons
an atoll in the Marshall Islands; site of an amphibious assault in World War II; later used temporarily by the United States to test atomic bombs
an atoll in the western Marshall Islands that was used as a Japanese air and naval base during World War II
an atoll in the Hawaiian Islands some 1300 miles to the northwest of Honolulu; site of an important United States naval base
an island consisting of a circular coral reef surrounding a lagoon
a long coral reef near and parallel to the shore
Florida key, cay, key
a coral reef off the southern coast of Florida
a submerged ridge of rock or coral near the surface of the water