Atoll (a Sinhalese word), a form of Coral Island (q.v.), consisting of a more or less interrupted ring of coral rock, enclosing a central lagoon. As examples may be mentioned Whitsunday Island, Keeling Atoll, Bow Atoll, Peros Banhos Atoll. See CORAL, ISLAND, POLYNESIA.
Atoll
Chambers's Encyclopaedia, Volume 1: A to Beaufort, p. 549
Source scan(s): p. 0572