noun \ˈa-ˌtl, -ˌtäl, -ˌtōl, ˈā-\

: an island that is made of coral and shaped like a ring

Full Definition of ATOLL

:  a coral island consisting of a reef surrounding a lagoon

Illustration of ATOLL

Origin of ATOLL

Divehi (Indo-Aryan language of the Maldive Islands) atolu
First Known Use: 1625

Other Geology Terms

anthracite, boulder, cwm, erratic, igneous, intrusive, mesa, sedimentary, silt, swale
ATOLL Defined for Kids


noun \ˈa-ˌtl, -ˌtäl\

Definition of ATOLL for Kids

:  a ring-shaped coral island consisting of a coral reef surrounding a lagoon


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