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English definition of “atoll”


noun [C]     /ˈæt.ɒl/ US  /-ɑːl/
a ring-shaped island formed of coral (= rock-like natural substance ) that surrounds a lagoon (= area of sea water ): the Bikini AtollSmall and large land masses
(Definition of atoll noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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