Definition of Atoll

a ring-shaped island formed by a coral reef encircling a lagoon

Examples of Atoll in a sentence

Scientists are exploring the atoll and taking samples of marine life found within the ring-shaped coral trove.  🔊

Because a circular atoll is enclosing the lagoon, the fish must swim through the reef to reach the other side.  🔊

An underwater island habitat of coral known as an atoll contains not only marine plants but also turtles and fish.  🔊

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