Atoll
(noun)
A coral island consisting of a reef surrounding a lagoon.
Origin:
From the dhivehi word "atholhu" meaning "island".
Examples:
- The Maldives is a chain of atolls in the Indian Ocean.
- The atoll is home to a diverse array of marine life.
- The atoll is a popular destination for scuba divers.
- The island was formed by the coral reef growing around a volcanic island.
- The atoll was nearly destroyed by the tsunami.