Origin of atollfrom atolu, in Maldive Islands dialect, dialectal of Malayalam
A coral atoll.
The definition of an atoll is a ring shaped coral reef, or close coral islands that enclose or almost enclose a lagoon.
The Bikini in the Pacific Ocean is an example of an atoll.
An island or chain of islets connected by a coral reef that nearly or entirely encloses a lagoon.
Origin of atollDhivehi atholhu probably akin to Sinhalese ätul interior (from the interior lagoon) probably from Sanskrit antala- interior variant of antara- ; see en in Indo-European roots.
An atoll is created as a coral reef builds up around an eroding volcanic island.
- It is impossible to estimate the total number of the islands; an atoll, for instance, which may slate in the Marquesas, which afford a type of the extinct volcanic islands, as does Tahiti.
- The Aldabra Islands constitute an atoll consisting of an oval ring of land, some 40 m.
- Minikoi atoll, with the numerous wrecks on its reefs, its lighthouse, and its position on the track of all eastward-bound vessels, is a familiar sight to seafarers in these waters.
- Long, with an extreme breadth of nearly 3 m., with a large but shallow lagoon approached from the north by a passage two fathoms deep. The atoll is growing outwards on every side, and at one place rises 19 ft.
- See Geographical Journal, passim; and Atoll of Funafuti: Borings into a Coral Reef (Report of Coral Reef Committee of Royal Society, London, 1904).