ˈaˌtȯl, -äl, -ōl also ˈā- sometimes aˈt- or əˈt- noun
( -s )
Etymology: native name in the Maldive islands
: a coral reef appearing above the sea as a low ring-shaped coral island or as a chain of closely spaced coral islets around a shallow lagoon that may vary in diameter from less than a mile to 80 or more
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