atoll

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atoll:

see coral reefscoral reefs,
limestone formations produced by living organisms, found in shallow, tropical marine waters. In most reefs, the predominant organisms are stony corals, colonial cnidarians that secrete an exoskeleton of calcium carbonate (limestone).
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atoll

[′a‚tȯl]
(geography)
A ring-shaped coral reef that surrounds a lagoon without projecting land area and that is surrounded by open sea.

atoll

a circular coral reef or string of coral islands surrounding a lagoon

ATOLL

References in periodicals archive ?
For as Francis Darwin points out, the Sketch and The Origin resemble each other in general structure and have the same order of material (Darwin, Works x: xix).
In The Descent of Man, and Selection in Relation to Sex (1871), Darwin points out the many physical characteristics common to humans and other animals, especially the great apes.