atoll

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atoll:

see coral reefscoral reefs,
limestone formations produced by living organisms, found in shallow, tropical marine waters. In most reefs, the predominant organisms are stony corals, colonial cnidarians that secrete an exoskeleton of calcium carbonate (limestone).
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atoll

[′a‚tȯl]
(geography)
A ring-shaped coral reef that surrounds a lagoon without projecting land area and that is surrounded by open sea.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

atoll

a circular coral reef or string of coral islands surrounding a lagoon
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

ATOLL

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