Wiktionary
n. A type of island formed from coral detritus and associated organic material.
Wikipedia
A coral island is a type of island formed from coral detritus and associated organic material. They occur in tropical and sub-tropical areas, typically as part of coral reefs which have grown to cover a far larger area under the sea.
Coral Island is a children's television series, adapted from the 19th-century novel The Coral Island by Scottish author R. M. Ballantyne. The series of 9 episodes was a joint production of the Australian Broadcasting Corporation and Thames Television. It was filmed on location in the western Samoan village of Salamumu and then on the Whitsunday Islands off the Queensland coast in 1981.
The series was first broadcast in Australia on ABC-TV on the 6 January 1983.
Usage examples of "coral island".
Within the lagoon were several pretty, low coral islands, just opposite our encampment.
They seemed to be low coral islands, raised but little above the sea, yet covered with cocoa-nut trees.