Definition of atoll in English:


Line breaks: atoll
Pronunciation: /ˈatɒl
, əˈtɒl


  • A ring-shaped reef, island, or chain of islands formed of coral.
    More 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.

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a small amount; a little