coral reef

noun

1. a reef composed mainly of coral and other organic matter of which parts have solidified into limestone.

coral reef

noun

1. a marine ridge or reef consisting of coral and other organic material consolidated into limestone

coral reef

1. A mound or ridge of living coral, coral skeletons, and calcium carbonate deposits from other organisms such as calcareous algae, mollusks, and protozoans. Most coral reefs form in warm, shallow sea waters and rise to or near the surface, generally in the form of a barrier reef, fringing reef, or atoll. Coral reefs grow upward from the sea floor as the polyps of new corals cement themselves to the skeletons of those below and in turn provide support for algae and other organisms whose secretions serve to bind the skeletons together. The resulting structure provides a critical habitat for a wide variety of fish and marine invertebrates. Coral reefs also protect shores against erosion by causing large waves to break and lose some of their force before reaching land. The Great Barrier Reef off the northeastern coast of Australia extends for some 2,000 km (1,240 mi), making it the world's largest coral reef.

coral reef

1. A formation, at or near the surface of tropical waters, formed by skeletal deposits of corals, a form of sea life.

Atolls — ring-shaped islands that nearly or entirely enclose a lagoon — are coral reefs.

Coral reefs form a protective environment for a wide variety of marine animals.

Coral reefs are very sensitive to chemical pollution and changes in temperature and are considered to be in danger from environmental stress.

The largest coral reef is the Great Barrier Reef of Australia.

Word History and Origins

Origin of coral reef¹

First recorded in 1735–45

Example Sentences

They expect that these insights will support efforts to protect coral reefs and help coastal communities manage the growing ecological and economic impacts of Sargassum blooms.

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Tropical coral reefs, the nursery for a significant share of marine life and crucial to the livelihoods of some 200 million people, are likely already reaching a tipping point, according to recent research.

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She compares the human body to a coral reef, where animals, plants, and microscopic organisms “cohabitate as one huge and beautiful chimeric metaorganism.”

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In a recently released report, a team of international climate scientists warns that saving many tropical coral reefs from destruction caused by rising ocean temperatures will now require extraordinary effort.

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Passing 1.5C include more frequent and intense heatwaves and storms, increased damage to coral reefs and growing threats to human health and livelihoods, UN scientists have said.

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Related Words

• atoll 
• beach 
• shoal