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What (who) is reef - definition

FEATURE LYING BENEATH THE SURFACE OF THE WATER

Reefs; Rock awash; Rock bar; Rocks awash; Temperate reef; Rocky reef

reef

(reefs)

A reef is a long line of rocks or sand, the top of which is just above or just below the surface of the sea.

An unspoilt coral reef encloses the bay.

N-COUNT

Reef

·noun A large vein of auriferous quartz;

- so called in Australia. Hence, any body of rock yielding valuable ore.

II. Reef ·noun A chain or range of rocks lying at or near the surface of the water. ·see Coral reefs, under Coral.

III. Reef ·vt To reduce the extent of (as a sail) by roiling or folding a certain portion of it and making it fast to the yard or spar.

IV. Reef ·vt That part of a sail which is taken in or let out by means of the reef points, in order to adapt the size of the sail to the force of the wind.

reef

reef¹

¦ noun

1. a ridge of jagged rock, coral, or sand just above or below the surface of the sea.

2. a vein of gold or other ore.

Origin

C16 (earlier as riff): from Mid. Low Ger. and MDu. rif, ref, from ON rif, lit. 'rib'; cf. reef².

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reef² Sailing

¦ noun each of several strips across a sail which can be taken in or rolled up to reduce the area exposed to the wind.

¦ verb take in one or more reefs of (a sail).

?shorten (a topmast or a bowsprit).

Origin

ME: from MDu. reef, rif, from ON rif, lit. 'rib'; cf. reef¹.

Wikipedia

Reef

A reef is a ridge or shoal of rock, coral or similar relatively stable material, lying beneath the surface of a natural body of water. Many reefs result from natural, abiotic (non-living) processes such as deposition of sand or wave erosion planing down rock outcrops. However, reefs such as the coral reefs of tropical waters are formed by biotic (living) processes, dominated by corals and coralline algae. Artificial reefs such as shipwrecks and other man-made underwater structures may occur intentionally or as the result of an accident, and are sometimes designed to increase the physical complexity of featureless sand bottoms to attract a more diverse range of organisms. Reefs are often quite near to the surface, but not all definitions require this.

Earth's largest coral reef system is the Great Barrier Reef in Australia, at a length of over 2,300 kilometres (1,400 miles).

https://en.wikipedia.org/wiki/Reef

Examples of use of reef

1. Scientists have expanded digital mapping of shallow water coral reef ecosystems, and local managers have revised fishery laws to protect reef species and habitats, increased local coral reef management capacity, and established coral reef protected areas.

2. REEF REAL ESTATE A groundbreaking ceremony marked the start of Reef Real Estate Investments two projects.

3. Another group watched an emotionally neutral clip about the Great Barrier Reef, the vast coral reef system off Australia‘s coast.

4. Relevant Web Sites NOAA http://www.noaa.gov/ NOAA Coral Reef Watch http://coralreefwatch.noaa.gov/ NOAA Coral Reef Conservation Program http://www.coralreef.noaa.gov/ U.S.

5. Investments in public outreach and education are increasing public awareness of coral reef ecology and conditions affecting reef ecosystems.