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 ?
Fostering partnerships and working together across all sectors in Reef management and the community is a key focus for the Marine Park Authority under the Reef Blueprint.
Reef balls are of varied sizes to best match the natural reef type.
The report is a joint output of the Global Coral Reef Monitoring Network, the Indian Ocean Commission, Coastal Oceans Research and Development in the Indian Ocean.
The success of the project has doubled to 12 the members of the HMC coastal management team, who foresee more reef installments in the pipeline.
The report also notes the reef is priceless and can't be replaced.
In the diverse marine world, coral reefs in the Maldives pull tourist attention the most.
While marine reserves are the most effective way of recovering fish populations, researchers agreed that a "one size fits all" approach of locking away reef resources is not feasible for many communities dependent on fishing.
The decline of shark populations through overfishing can have a detrimental effect on coral reefs, according to a new study published in PLoS One.
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.
The Seaview Survey's shallow reef team will utilize a revolutionary SVII camera with the ability to take continuous 360 degree high-definition images to explore at an average depth of 26 feet of water.
That gap represents the collapse of reef ecosystems for 40 percent of their total history," Toth said.
Australian organisations managing the reef have adopted high-quality practices, UNESCO said, but noted that "despite management successes there has been a continuing decline in the quality of some parts" of the reef.