Crossword Genius

Ring-shaped coral island (5)

Ross

I believe the answer is:

atoll

(Other definitions for atoll that I've seen before include "Coral isle" , "Pacific coral island" , "Coral island(s) surrounding a lagoon" , "Ring-shaped coral reef enclosing a lagoon" , "land threatened by rising sea levels" .)

I've seen this clue in The Guardian and The New York Times.
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