reef

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reef:

see coral reefcoral reefs,
limestone formations produced by living organisms, found in shallow, tropical marine waters. In most reefs, the predominant organisms are stony corals, colonial cnidarians that secrete an exoskeleton of calcium carbonate (limestone).
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Reef

 

a sharp underwater or above-water elevation in the sea floor in shallow water that hampers navigation. Reefs are formed either by the erosion of the bottom and coasts of the sea or by colonies of coral.


Reef

 

a device for reducing sail area during a strong wind. The reef is usually a series of bands threaded through the sail, by means of which the sail is folded up when the boom or yard is taken up—that is, the sail is reefed, or taken in. Sails may have from one to four reefs.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

reef

[rēf]
(geology)
A ridge- or moundlike layered sedimentary rock structure built almost exclusively by organisms.
An offshore chain or range of rock or sand at or near the surface of the water.
(mining engineering)
A major ore trend or ore body.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

reef

1
1. a ridge of rock, sand, coral, etc., the top of which lies close to the surface of the sea
2. a ridge- or mound-like structure built by sedentary calcareous organisms (esp corals) and consisting mainly of their remains

reef

2 Nautical
the part gathered in when sail area is reduced, as in a high wind
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Fort Lauderdale, FL, September 04, 2019 --(PR.com)-- The 1000 Mermaids Artificial Reef Project is proud to have deployed the first 18 of their artistically crafted artificial reef modules into the ocean in Palm Beach County, two and a half years after the project was originally conceived.
The exact composition of most new reefs is currently unknown, due to the expense of collecting genetic and species diversity data.
"The clarity in this trend is stunning, but we don't yet know whether the new reefs can support the incredible diversity of tropical systems," Price added.
Coral reefs play a vital role in the marine ecosystem because even if it occupies only 0.1 percent of the Earth's water area, around 25 percent of marine life actually live here.
Some reefs around the world are thriving despite increasing sea surface temperature and ocean acidification.
If you want a coral reef, the Bahamas-based startup Coral Vita is the place to go.
ShORe center focused on fringing reefs. Licuanan explained during the interview that fringing reefs are 'attached to land.
Some people have wrongly labeled artificial reefs as "ocean dumping." This is inaccurate for a number of reasons.
Needing to change our visual and professional perspective was the common theme behind several promising low-cost technical solutions reviewed at a recent Coral Reef Restoration Workshop.
BBC - Australia has pledged A$500 million ([pounds sterling]275m; $379m) to protect the World Heritage-listed Great Barrier Reef.
It continued to build up seven of the reefs and features despite the court's declaring (Page 477) that: