barrier reef

a reef of coral running roughly parallel to the shore and separated from it by a wide, deep lagoon.

1795–1805 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
barrier reef
See Great Barrier Reef a long narrow coral reef near and lying parallel to the shore, separated from it by deep water

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
barrier reef  
A long, narrow ridge of coral that runs parallel to the mainland and is separated from it by a deep lagoon. Compare atoll, fringing reef.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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