Definitions

1. noun

A ring-shaped coral reef surrounding a lagoon, typically formed when a coral reef grows around a volcanic island that has subsided or eroded.

“The atoll was a haven for marine life, with a diverse array of fish and coral species.”

2. noun

A circular or oval-shaped reef or island, often formed from coral or volcanic rock.

“The atoll was formed from the remnants of a long-extinct volcano.”

3. noun

A type of ring-shaped coral reef found in tropical waters.

“The atoll was a popular spot for snorkeling and scuba diving.”