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atoll Tweet Definition of atoll Like Definition of atoll on Facebook
noun 
  1. A type of island consisting of a ribbon reef that nearly or entirely surrounds a lagoon and supports, in most cases, one to many islets on the reef platform. Atolls have a unique geology, so not all islands with a reef and a lagoon are atolls.
Etymology: From Dhivehi "ab-tal" < Persian (fa-Arab, "Ù) (Äb-tal), meaning water-hillock.


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