Atoll definition

ătôl, -ŏl, ātôl, ātŏl
Frequency:
A coral island or series of coral islands forming a ring that nearly or entirely encloses a shallow lagoon. Atolls are surrounded by deep ocean water and range in diameter from about 1 km (0.62 mi) to over 100 km (62 mi). They are especially common in the western and central Pacific Ocean and are believed to form along the fringes of underwater volcanoes.
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A ring-shaped coral island nearly or completely surrounding a lagoon.
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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.
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The definition of an atoll is a ring shaped coral reef, or close coral islands that enclose or almost enclose a lagoon.

The Bikini in the Pacific Ocean is an example of an atoll.

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An island or chain of islets connected by a coral reef that nearly or entirely encloses a lagoon.
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Other Word Forms

Noun

Singular:
atoll
Plural:
atolls

Origin of atoll

  • Dhivehi atholhu probably akin to Sinhalese ätul interior (from the interior lagoon) probably from Sanskrit antala- interior variant of antara- en in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Malayalam അതൊലു (atolu, “reef”) and Dhivehi އބތަލ (ab-tal), from Persian آب‌تل (āb-tal, “water-hillock”)

    From Wiktionary