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Definition of atoll in English: atoll. Pronunciation /əˈtɒl/ /ˈatɒl/ noun. A ring-shaped reef, island, or chain of islands formed of coral. Example sentences ‘The Philippines is an archipelago of 7,100 islands, islets, and atolls located southeast of the Asian mainland.’. In 2015, 83 per cent of new parents had home visits from the public health centres, and almost all infants underwent a health examination within eight weeks of birth. Health examinations for children of pre-school age and in their first year at school have nearly full coverage.