Hypertext Webster Gateway: "Atoll"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Atoll \A*toll"\, n. [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) 1.7 (wn)
atoll
n : an island consisting of a circular coral reef surrounding a
lagoon
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