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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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.

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.

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
References in periodicals archive ?
Two other notable approaches are (1) efforts to address land-based marine pollution affecting coral reefs; (188) and (2) efforts to educate the public about threats to coral reefs, and how our choices as consumers can impact the survival of reefs.
Regional Queenslanders have excellent ideas for how to benefit the Reef," she said.
Reef balls are of varied sizes to best match the natural reef type.
Numerous patches of reefs and extensive fringing reef are located along about two-thirds of Kenya's coastline.
FLOURISHING A year and a half after transplantation, new coral colonies are seen attached to the coral reefs.
That estimate considers the social, economic and iconic value of the reef that (http://www.
Most reefs are south of the Tropic of Cancer and north of the Tropic of Capricorn.
Ever since 2008, this collaboration has been taking steps and implementing procedures to secure coral reefs in the Maldives and in a few other countries.
Coral reefs are among the most diverse ecosystems on Earth, providing an important habitat for a wide range of species, and as a result, people in many tropical countries depend on them for their livelihoods.
The reefs provided us with a unique opportunity to isolate the impact of overfishing of sharks on reef resilience, and assess that impact in the broader context of climate change pressures threatening coral reefs,' said Jonathan Ruppert of the University of Toronto.
If enhanced production is occurring, then red snapper diets should contain reef prey species; but, if only attraction is occurring, red snapper should be feeding on prey species not found on reefs.
Ove Hoegh-Guldberg, director of the Global Change Institute at the University of Queensland, says that the world will lose more from eroding reefs than a source of natural beauty.