Definition of atoll in English:

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Pronunciation: /ˈatˌôl/
Pronunciation: /ˈatˌäl/


A ring-shaped reef, island, or chain of islands formed of coral.
Example sentences
  • The islands of the Maldives are grouped in ring-shaped coral atolls, each enclosing a relatively shallow lagoon with a flat sandy bottom.
  • The Marshall Islands are a group of low-lying coral atolls and islands in the central Pacific Ocean.
  • Tuvelu is one of the smallest countries on earth, a chain of nine coral atolls whose highest point is just a few meters above sea level.


Early 17th century: from Maldivian atoḷu.

For editors and proofreaders

Syllabification: at·oll

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