중심부에 석호를 품고 고리 모양으로 배열된 산호초나 섬의 무리.
A ring-shaped coral reef, island, or chain of islands surrounding a central lagoon.
예문:
"The aircraft landed on a small airstrip built on the largest island of the atoll."
"Marine biologists are studying the health of the coral formations within the atoll."
"Rising sea levels pose an existential threat to the low-lying communities on the atoll."