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Definitions

reef

[reef] / rif /
NOUN
underwater or partially submerged ledge
Synonyms


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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A ship that was once the fastest in the world and is longer than the Titanic will be sunk off the coast of Florida and turned into the world's largest artificial ocean reef.

From BBC ● Nov. 11, 2026

Until now, the largest artificial reef was an aircraft carrier sunk 20 years ago off the coast of Pensacola, also in Florida.

From Barron's ● Nov. 11, 2026

Unlike other parts of the reef that experience devastating outbreaks, these locations maintain relatively low populations of crown-of-thorns starfish.

From Science Daily ● Nov. 1, 2026

In the first global assessment of its kind, the world authority on threatened wildlife classified 96 percent of the planet's coral reef systems as "critically endangered" -- its highest risk category.

From Barron's ● Oct. 22, 2026

Mon-a-nee came close to the reef and I threw a fish into the water.

From "Island of the Blue Dolphins" by Scott O'Dell

Then there’s the prospect of devastating displacements caused by weather-related disasters, the death of much of the earth’s coral reefs, and large parts of the population being exposed to extreme heat.

From The Wall Street Journal ● Nov. 13, 2026

Instead, after being purchased by a Florida county, it will be added to the dozens of artificial reefs off the coast, as a land-based museum detailing the ship's history is also planned.

From BBC ● Nov. 11, 2026

Understanding these physical features could help scientists investigate biological processes in settings ranging from human digestive health to the recovery of damaged coral reefs.

From Science Daily ● Nov. 9, 2026

Similar relationships between bacteria and mucus help sustain coral reefs, kelp forests, plant root systems, and the digestive systems of humans and other animals.

From Science Daily ● Nov. 9, 2026

Then beyond the gleam of the beach and the bare rocks and reefs, more than a league beyond them, I saw a great white crest moving down upon the island.

From "Island of the Blue Dolphins" by Scott O'Dell

Divers and many fishermen want more to be reefed; shrimpers complain that reefs prevent them from dragging nets across parts of the ocean floor.

From Economist ● Jun. 12, 2014

Currently, less than a tenth of America’s old oil and gas platforms are reefed.

From Economist ● Jun. 12, 2014

John Hocevar, its head of ocean campaigns, concedes that in some locations reefed platforms, if non-toxic, may increase marine life.

From Economist ● Jun. 12, 2014

Under reefed capital sail C. & E. I. bad a good chance to operate at a profit.

From Time Magazine Archive

There was a sailboat with rusty red sails reefed around the booms of the fore and aft masts.

From "Hole in My Life" by Jack Gantos

Part of that action is Patten’s realization that the sailor’s standard storm tactics—including reefing, heaving-to and lying a-hull—will not work in such an intense blow.

From The Wall Street Journal ● Dec. 8, 2025

For now, the evidence suggests that reefing is a rare policy.

From Economist ● Jun. 12, 2014

Operators typically favour reefing but it is not always economical or allowed, says David Welch of Stone Energy Corporation.

From Economist ● Jun. 12, 2014

But the science regarding the safety of artificial reefing is still being developed.

From Time Magazine Archive

Pole Star was reefing its own sails and slowing, guiding itself with the minimum acceleration so that it could come up beside them and board.

From "Ship Breaker" by Paolo Bacigalupi


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