From The Collaborative International Dictionary of English v.0.44 [gcide]:
Atoll \A*toll"\, noun [The native name in the Indian Ocean.] A coral island or islands, consisting of a belt of coral reef, partly submerged, surrounding a central lagoon or depression; a lagoon island.
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
20 Moby Thesaurus words for "atoll": ait, archipelago, bar, cay, continental island, coral head, coral island, coral reef, holm, insularity, island, island group, islandology, isle, islet, key, oceanic island, reef, sandbank, sandbar
From The Free On-line Dictionary of Computing (27 SEP 03) [foldoc]:
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