atoll ˈa-ˌtȯl , -ˌtäl, -ˌtōl, ˈā- noun
: an island consisting of a circular coral reef surrounding a lagoon
The word atoll has appeared in 27 articles on NYTimes.com in the past year, including on Nov. 4 in “A Lake With Stingless Jellyfish and Hints of Hotter Seas” by Richard C. Paddock:
In a rare marine lake on a hatchet-shaped atoll in Indonesia, four species of jellyfish have evolved in isolation and lost their ability to sting humans. There are believed to be millions of these benign jellyfish in Kakaban Lake, which has become a popular spot for tourists intrepid enough to reach the remote archipelago known as the Derawan Islands.