atoll

[at-awl, -ol, -ohl, uh-tawl, uh-tol, uh-tohl]
noun
a ring-shaped coral reef or a string of closely spaced small coral islands, enclosing or nearly enclosing a shallow lagoon.

Origin:
1615–25; earlier atollon < French: a word used in early descriptions of the Maldive Island atolls; said to be Divehi (Indo-Aryan language of the Maldives) atoḷu

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
atoll (ˈætɒl, əˈtɒl)
 
n
a circular coral reef or string of coral islands surrounding a lagoon
 
[C17: from atollon, native name in the Maldive Islands]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

atoll
1620s, atollon, from Malayam atolu "reef," probably from adal "closing, uniting." Popularized in present form by Darwin's writings.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
atoll  [%PREMIUM_LINK%]     (āt'ôl', ā'tôl')  Pronunciation Key 


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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. Compare barrier reef, fringing reef.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
atoll [(a-tawl, a-tol, ay-tawl, ay-tol)]

A coral island that surrounds a lagoon. (See coral reef.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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FOLDOC
Computing Dictionary

ATOLL definition


Acceptance, Test Or Launch Language

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
He announces he hasn't come to claim her, but to investigate reports that the atoll is rich with uranium.
The reef and atoll systems that have evolved here in isolation remain virtually untouched by humans.
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