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.

Notes

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

However, they are also among its most vulnerable, with areas of coral reefs, mangrove forests and seagrass beds under increasing threat from a wide range of human activities.

From Science Daily

Yet as coral reef ecologist Alexandra Dempsey explored the atolls’ beautiful coral reefs in 2015, she nevertheless found signs of human pollution.

From Salon

This specimen was found in deeper waters than some coral reefs, which may have protected it from higher temperatures at the sea surface.

From BBC

California moray eels live in coral reefs from Point Conception in Santa Barbara County to southern Baja California in Mexico, according to the Monterey Bay Aquarium.

From Los Angeles Times

Within his first days reporting for Olympics duty, Jost had injured his left foot on the island’s coral reefs.

From Los Angeles Times

Related Words

• atoll
• beach
• shoal