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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.

Martindale and her research team, including Stéphane Bodin of Aarhus University, were exploring the rugged valley to study the ecology of ancient reef systems that once existed there when the area lay beneath the ocean.

From Science Daily • Mar. 8, 2026

The tide was lower than expected, so the landing craft were hung up on a reef.

From The Wall Street Journal • Mar. 4, 2026

The team combined satellite measurements of ocean surface temperatures from the Coral Reef Watch system with on site reef surveys and aerial observations collected worldwide.

From Science Daily • Feb. 12, 2026

The clandestine artisanal miners, many from neighbouring countries, have become an entrenched presence in the shantytowns that ring Johannesburg and its satellite settlements along the gold reef.

From Barron's • Jan. 23, 2026

The reef is gnarly here, not something a surfer wants to be dropped on by a ten-foot wall of water.

From "Clairboyance" by Kristiana Kahakauwila