reef

word

/ˈɹif/
reef
/ɹˈiːf/
reef

Definition

A reef is a long line of rocks or coral just under or above the surface of the sea, often home to many sea creatures.

Usage & Nuances

Used mainly for marine geography; 'coral reef' is common for reefs formed by corals, like the Great Barrier Reef. Not used for river or lake formations. 'Reef' is sometimes confused with 'reef knot' (sailing) or 'reefing' a sail, but those are unrelated.

Example Sentences

We saw many fish swimming near the reef.

basic

A reef can be dangerous for boats.

basic

The Great Barrier Reef is very famous.

basic

Snorkeling over the reef was the highlight of my trip.

natural

Be careful—the boat could hit a reef if the water gets too shallow.

natural

There’s an amazing variety of life on this reef.

natural