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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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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

But this year's El Nino layers "a terrifying level of additional risk", said Obura, a Kenyan reef expert and chair of IPBES, the UN's expert scientific panel on biodiversity.

From Barron's ● Oct. 15, 2026

On Tuesday, the crew plans to navigate through a narrow gap "blasted" in the atoll's reef by the British in 1963 - the last time the island was inhabited - to prepare for landing.

From BBC ● Oct. 12, 2026

Hike from ridge to reef Mason’s Travel tour company leads a guided hike through Mahé’s lush Morne Seychellois National Park to secluded Anse Major beach, followed by snorkeling at Cap Ternay Marine Park.

From The Wall Street Journal ● Sep. 29, 2026

Shackleton waited for an opening in the surf and then gave a shout for the men to pull with their last strength through the reef.

From "Shipwreck at the Bottom of the World" by Jennifer Armstrong

These clones grow together into large colonies that form the foundation of coral reefs.

From Science Daily ● Oct. 19, 2026

A super El Nino fuelling record ocean temperatures poses a "terrifying" threat to the world's fragile coral reefs, the chair of the UN's expert nature panel told AFP.

From Barron's ● Oct. 15, 2026

Since then, global ocean temperatures have soared to unprecedented highs and the worst coral bleaching episode on record between 2023 and 2025 caused widespread mortality across reefs.

From Barron's ● Oct. 15, 2026

As coral reefs struggle to survive, many sharks are losing their main food source, but humans are to blame for that one.

From Salon ● Oct. 9, 2026

However, scattered throughout the dark depths were shallow areas: sandbars, reefs, islands just under the waves.

From "The Wild Robot Escapes" by Peter Brown

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

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

From Economist ● Jun. 12, 2014

Not one platform off California has been reefed.

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

The main, still reefed, he tightened a bit to match the jib and the Frog seemed to leap ahead.

From "The Voyage Of The Frog" by Gary Paulsen

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

Within five years oil firms will be reefing one offshore rig in four, predicts Quenton Dokken of the Gulf of Mexico Foundation, a conservation group.

From Economist ● Jun. 12, 2014

State coffers gain: oil firms typically hand over half the money they save by reefing.

From Economist ● Jun. 12, 2014

A day later, their mainsail tore up the leach from the first reef and ripped the reefing pad eyes from the mast.

From Time Magazine Archive

Already reefing from the floods, Cahokia never recovered from the earthquake.

From "1491" by Charles C. Mann


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