Crossword Genius

Ring-shaped island (5)

Ross

I believe the answer is:

atoll

(Other definitions for atoll that I've seen before include "Pacific coral island" , "Coral island with central lagoon" , "Bikini, perhaps" , "tropical island" , "Ring-shaped coral reef enclosing a lagoon" .)

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